I love the car, and it's a blast to drive. I pumped it up to maybe 350 hp for some of the races, and it's a great little vintage car.
One disappontment with it, and that's the way it's modeled. If you look at the real E-Type from the top, you'll see that the real car's width tapers from nose to tail. The tail is a fair bit narrower than the front, as is the rear track width. This actually eliminates a good amount of the car's oversteer. The GT5 version doesn't taper at all -- the left and right edges of the car are perfectly parallel.
You can see it in replay, that the rear fenders are just too wide. I'd love it if PD would fix this, because it's one of the most beautiful cars ever built. They kind of have other things on their plate, though...