I've just been there, and I'd like to say, I was very impressed.
If you haven't see a LaFerrari, an Enzo, a Testarossa, or maybe a Lamborghini Countach or a Diablo in real life, or maybe interested in a 40's or 50's Rolls Royce Phantom, you should head over there. I've even seen a DeTomaso Pantera, and an XJ220 as well
(funnily they had eastern block oldies, too, some familiar Skoda, Traband, Lada, Polski, Volga and even a couple of Tatra models were there)
The collection is huge. They've hundreds upon hundreds of cars, including some that are for sale (like an R32 Skyline, a Ferrari 360, a couple of E-types...) at the back.
It's been something I meant to do for a while, but I wanted to go with a mate who just had a baby so it was just delayed and delayed...but now I'm thinking I should go back again, the 2 hours was barely enough to gawk myself out.
One negative is that it's very much like a museum, you can't go really up close and in some cases this means you can't easily see the car from all angles. Also it'd be great to be able to open the bonnet of a few of them
Another negative is that it'd be good to see a bit more on some cars - often it's just a brand & model name. Sometimes it's specs as well, and sometimes (the best) there's some history included.