From what I've read, it's pretty technician specific whether they do a good job or not. The equipment firestone uses is pretty decent stuff. I found a store that my friend has used and had good success with.
I just got the prealignment slip from them and everything is all it of whack... not sure how it happened...
I'll update as to if this fixes the problem and other experience notes.
'07 Space Gray 335i coupe w/ Sports Package | Comfort Access
Cobb S1+ | PTF e30 custom tune | AMS | CP-e | BMS OCC | Quaife
[Newark Photoshoot #1]