I have a QA1... and it's ok...
CONS:
I had to cut a little bit off the control arms (like everyone has said)
It moved my tires forward and now my tires rub on the front ground effects
My chassis might be twisted, but I had to redrill the holes in the secondary support brackets just to get the bolts though, and I can only get one of the two bolts in. The primary ones are ok.
When bolting up the primary, it took me forever to get the bolt holes to line up
There are two slots where you can rest your motor on. I am using the front slot and it seams like it pushed my motor back to the firewall an inch or so...
I can't pull the rack and pinion off without lifting the motor (it might be because of my oil pan)
PROS:
It's tublar, so it's very stong.
I like the amount of working room it gave me underneath.
Saved lots of weight.
If I could do it over again, I would check out a different company to see if they would fit better.... if there wasn't, I would go with the one I got.