i have no experience but I see some good feedback on these tires. not sure about serious track use but for normal, fun driving I would not hesitate to put them on. They are on my shortlist when the time comes.
I have them on my elise and my daily. They are not a super sticky tire, and if I tracked often I would choose something else. With that said, I think they are a great on wear, good on performance and very reasonably priced. They are exactly what i was looking for in a tire for a car that sees mostly spirited street driving and occasional autocross/track.
Strange, I thought that I had replied on this thread earlier but I guess I forgot to hit "post"
I replaced my Evoras rear tires with Firehawks and have been very happy with them. I haven't tracked the car but they are very comfortable on regular driving and even at high speed on the highway (I'm not posting numbers but it was "high speed")
I only replaced the rears and did go with 255/35r19 through TireRack.
Funny side note: I must have fat-fingered the order and got the wrong ones. TireRack agreed to swap them for no cost when I bought the correct set. They delivered the correct ones, picked up the wrong ones and then sent me a Firestone rebate for buying "four" tires! ?
/Since the MPS4S are more than a month backorder, I need to get my rears replaced quick. I saw this thread and wonder if I should get these in 285/30/20 instead of MPSS. the PSS wear down way too quick on the street. MPS4S were much better on wear but still not that great. Felt really good on the streets though.
Here is my short review of them on my car daily driving them for about 100 miles now in the last 2 days
They are much more forgiving with the road bumps and potholes. They feel like the same "stickiness" as the MPS4S. My butt doesn't feel any different with the way the car handles on the street. I know the top speed is no longer 199 and mere 160 or something but on the street, it does the job. I haven't taken it passed 110 yet but it handles absolutely same at that speed.