I put the Phase 2 Roush TVS blower (625hp) on my car last year and actually drove to Roush in Livonia, MI to have them do it at the Speed Shop. I'm more than a little particular on who I let work on my cars, and I just couldn't find a local shop that I felt had any experience with this blower / car.
As others have said, the Roush tune is nice and safe but runs very very rich and has "stock" throttle response and transmission settings (if you have an AT like I do.)
I very recently bought a tune from Justin at VMP Tuners and despite a little bit of a wait to actually receive the tune (apparently he was fine tuning some AT calibrations) it's like a whole different car with the aftermarket tune.
I'm sure Brenspeed's tunes are excellent also, but I did LOTS of research for quite a while before settling on VMP and from everything I found, Justin is THE guy for TVS2300/Roush blower kits on the 5.0. So far, so good but I can't wait to get it to the track!
That because Roush kit has warranty it's going to be on the safe side. Aftermarket tune it blows up you SOL