some stuff to keep in mind:
The ride height looks perfect, however they're not extremely firm springs (they're firmer than the pro-kit, firmer than roush, and I think slightly less firm in the rear than steeda sports). You need to make sure you get proper bumpstops for them and make sure if you have aftermarket catbacks that they clear properly.
Because they're not overtly firm and very low, you will find those bumpstops from time to time, and I'd at least plunk down the extra $300 for some STR.T's from koni to control them.
Other than a harsh bump here or there, I'm pretty happy with mine.