I bought a spinner and steering wheel from them a while ago and here are my thoughts on them:
Spinner:
It's ok, but it's not great. I like that it is ready to plug into the computer and works right out of the box, but they don't use a bearing on this spinner (they just cut a hole in the plastic case a tiny bit bigger than the shaft and that is what makes it spin). I ended up using the mouse guts and encoder wheel out of this spinner to get a hard drive spinner working (I'm much happier with that home made spinner).
Honestly, if I didn't have the other spinner to compare it to (the hard drive spinner), then I probably would have stayed happy with the ezarcadesolutions one. It doesn't keep spinning after you give it a good twist, but for the most part, it is acceptable in games like arkanoid, definately not for people with fond memories of real arcade spinners.
Steering Wheel:
I know they list on the site that it's only 7", but I was still suprised to see how small the wheel was when I opened the package (it looks a lot bigger in the pic on their site). Even though it seems small, that was a great purchase. It fits right onto the spinner shaft and tightens down with an very small allen wrench (I guess that is probably my biggest beef with it, the knob uses a small screw, so I have to keep both a small screw driver and a small allen wrench around to change it, small complaint I guess).
The wheel is really light plastic, but it feels sturdy enough for what I use it for. I know others have shown concern about bending the shaft with the extra leverage that the wheel provides, but I don't see that being a problem (I'm sure the wheel would break before that happened, don't know if that is a good thing).
It's a lot of fun with the Ironman Ivan Stewarts Off Road (I think that was the name of it, I kept looking in the "O's" for "Off Road" and then discovered it was in the "I's" for "Ironman Off Road" or something like that).
I think the wheel is worth the purchase, although I'm sure it could be found elsewhere for cheaper (maybe not the same exact wheel, but something that works just as well). I won't be buying anymore spinners from them, but I'm tempted to get another steering wheel for my brother in laws cab.