I have one of the Visium tops - they're great. I would recommend one over a factory top to anyone that asks my opinion ( I have both).
The Visium top is much easier to put on and take off - the mounting hardware is much less fiddly than the factory top.
I have a black Elise so, the tinted Visium top looks really good on it. I think this would be a different case if your Elise is Fly Yellow.
It does make the car feel less claustrophobic. It doesn't make the car noticeably hotter (but then, I don't install it in June...I use it in January.) If it's over 45°, the top is off. If it's raining, I don't drive the car.
's failure of his - I have no idea what happened. I know that he and I aren't the only people that own these, and he's the only person I've heard about that's had that sort of a problem. I've used mine for several years, on two different cars (I originally bought it for my Tesla Roadster, and kept it when I got the Elise). It's been faultless.
I do agree with some that the price is a bit high. I haven't looked into them in a while but, when I bought mine, they had a "Standard" version and a "Deluxe" version - I got the Deluxe version...which came with a cleaning kit and a soft cover. The soft cover is OK but, these "additions" really weren't worth the additional price. I felt like I got a little ripped off with the "Deluxe" version.
The other really nice feature of the transparent top is that, when you're first at a stop light, you can look up, through the top and see the signal light. As these cars are so low, we all know that you're always looking UP at everything (including slammed Civics). With the factory (opaque) hardtop, you're just blind to a lot around you. With the transparent top, it opens everything up.
With all of that being said, I applaud
and his efforts - I'm curious to see what he comes up with; especially his alternative mounting solution. However, given that I already own two hard tops (and don't use either of them that often), I probably won't be a customer.