I promised a review, so here it is. Apologies for the length, but I hope being more in-depth will help people make a more informed decision.
Keep in mind I am coming from stock LSS suspension. I had previously installed a BWR front sway bar, which was set at the second hole from full soft. The bar wasn't touched. The car was aligned and corner balanced. Installation was smooth, and the alignment settings are 1.5 degrees of front camber and 2.5 degrees of rear camber. 3.something degrees of caster and just a touch of rear toe in. The car was very minimally lowered. Maybe 5 mm lower than stock all around. I may have one of the highest riding Penske equipped Lotuses out there. My car has a stock Torsen LSD, 15/16 inch Volk CE28Ns, and 195/50-15 and 225/45-16 Dunlop Direzza Z2 Star Specs. So onward...
On the street: The ride is much nicer than the LSS and a bit nicer than the standard black Bilstein suspension (I had previously owned a base suspension Elise before my current one). On lower amplitude bumps, you hear it more than you feel it, though the sound the suspension makes over bumps is a bit different than stock. Higher amplitude bumps result in a firm, but not harsh, impact. Very well controlled. There is one section of Highway 237 up in San Jose where just the right amount of speed, bump amplitude, and bump frequency seemed to set in motion almost a resonant frequency within the suspension. My guess is, since those bumps were more of a gradual much and down and hence, don't result in very high wheel speeds, that that's where the blow-off is happening in the damping curve. A little more damping in that mid-speed region would probably fix the problem. Overall though, the car handles well on the street and rides extremely well. Much better than stock.
On the track: Streets of Willows is what I consider to be my home track. I'm very familiar with it, and I feel it's a track that can really showcase a car's handling. The following is a map of Streets of Willows, for reference:
Speedventures puts a haybale at turn 10 that is just balls. They say it's for safety, but it cuts the track in half and really makes me feel like I'm going to do something bad everytime I go through there. They also say it slows you down by 0.5 seconds, but I believe it's more like 1.5 seconds. Nobody likes that damn haybale, but they keep putting it there.
Still, the suspension performed very well. So well that my friend who rode with me said he was still amazed by my suspension two days after the trackday (he drives an AE86, a S2000, and a 997 and has an E30 M3 lying around not getting miles).
The car really is composed. Through turn 1, which is high speed and off camber, the Lotus previously didn't like it when you put the car on the inside curbing, which is small and a bit high. With the Penskes, I didn't even realize I was putting the car on the inside curbing until the second session, when I heard the tire noise change when going over the curbing. That's amazing! Also, previously I had zero confidence that the car could go flat through turn 1, where if you spin you might be totally the car. Now, I swear the car can go flat through turn 1. I didn't have the balls to try it though, as winds were high all day and having your car be pushed half a car width offline in the middle of the corner can be scary.
The car is just generally controllable. Turn 2 rewards trail braking and a lot of rotation. Of course, sometimes you'll overdo your rotation, but with this suspension, it's basically a flick of opposite lock and you're back going where you want to go. The car is also very responsive. Extremely responsive. I could transition between the turn 5, a left hander, and turn 6, a right hander, so quickly that it felt like I was punching the side of my body with my seat bolsters (I have a Bride Zodia). I always expect the car to be unsettled going from left to right so quickly, but it stayed drama free all day and I think it could take more. In general, the car never did anything that seemed like it would get away from me.
I am considering adding some bumpstops though, perhaps just to the front. Through turn 8, the bowl, where I can pull more than 1.2 gs, the outside front tire was rubbing the fender liner. I know Lotus guys tend to view fender liner rub as a normal occurrence, but part of the reason I changed to 15" front wheels was to eliminate the rub. Now the rub is back and it'll probably drive me crazy if I don't fix it. I might get some short aftermarket bumpstops and cut them down further to about 25mm or so in height. I know Fred says bumpstops aren't needed, but I HATE HATE HATE rubbing.
One nice advantage is I could put a ton of power down very early. Compared to the stock suspension, I felt I could get on the power a touch (like half a car length) earlier since the car was no longer being unsettled by a bump in the middle of the bowl. My friend, who followed me in his C7 Z06, reported that he was amazed how quickly I could exit the bowl. He basically said the Lotuses and the AWD monsters were the only cars he couldn't catch coming out of the bowl.
The other amazing part about the nice ride was over the chicane. The chicane is a bit bump right where you'll be doing some braking (a lot of braking in this case because of the damn haybale). You could really feel the bumps with the LSS suspension, but with the Penskes it feels like you're gliding over them. You just have so much more confidence with them than with the LSS.
Overall, my best time of the day was a 1:30.1. My personal best at Streets was a 1.29.4, but that's without the haybale. Without the haybale on the Penskes, I'm pretty sure I can run into the 1:28s, and without high wind conditions I might be able to break into the 1:27s. That's not a world beater time, but the 1-1.5 second improvement that I forecast with this suspension is pretty impressive considering it was the 6th trackday for these tires and the grip is very obviously going away. I'm really curious to go back with fresh rubber (and a bit more front camber), but alas the 225/45-16 Star Specs are back ordered.
Overall, I'm very impressed, though I might be tweaking it just slightly. Advice about how to do so would be appreciated, if anyone has some thoughts.