Hi STI,
I have both on my car since wheel hop was an issue the one thing I ran across is that the stock upper bracket is rather flimsy(The accident you refered to I believe was running the stock upper bracket) (Steeda sells this as a unit). So I had to replace the upper bracket with the upper control arm it's not a fun install. The lowers are rather simple and shave a little weight.
All and all the rear feels much tighter and the car has zero wheel hop. High rpm launch will just burn the tires through first though you can get a nice little 2k start on the stocks and it will hook and go nicely. I would recommend getting the panhard bar and brace while your at it. On mine the rear of the car feels good and sturdy and good on the freeway on ramp loops as well.
Hope this helps.