Yes i looked into them a while back, they seem like a good option and ive heard nothing but good things about them
From my experience of dyno days...Superchipped cars seem to make the numbers they suggest...whereas others don't.
Other companies may claim more power, but at the end of the day, there is a finite limit to what the engine will safely produce when re-mapped...and I doubt there's much between the major tuners in headline numbers.
Delivery perhaps..but not peak numbers.
No matter what some optimistic dynos might suggest.