Personally I would save the cash and go to a Dyno day where they can tune the system for YOUR car specifically ( intake, exhaust, etc ) - I've looked into different companies that provide this tune and although many people have had good results, I'd rather have something for MY car rather than a generic program thats downloaded to the system. Exhaust for example, there is a difference between the GTR, magnaflow, cat back, single/dual, etc and I'm not comfortable with the 'well this will work'.
As far as 'quick turn around' - the 5 or 6 threads have been deleted by the mods ( Wams is a vendor on this public forum ) which listed issues with turn around and inability to properly contact the seller.
To each his own, but I'd rather go with the $200 to $350 dyno tune where I can tell them 'I want this specific type of a drive' ( low end torque, high end speed, fuel economy, etc )
I had a Dyno tune done on my old Passat turbo, it had a normal, 91 and 93 octane ( turn car off, hold down cruise control for 5 seconds and it would 'chirp' changing to each pre-programmed setting ) and it ran me $275 and took about an hour and a half. The place I went also had a 1 year warranty on it so if things were not perfect for you on a day to day drive, you could go back for 25 bucks and say '3rd gear isn't pulling enough, I need to up that' and its done.
Again - each to there own but WAMS is by far the easiest - send a check and wait for it in the mail : )
David Hall - 2009 Pontiac G6 GT Blue 4-Door
Performance: CRABS 03 and FPU, Resonator Delete, RL Strut Tower Bar
Appearance: Debadged - Window Tint 35% front 18% back - Emblem Overlays - Door Sill Overlays