I like my Predator tune, but I think the LS1 Edit is a far better tuning devise. The Predator you can change tunes for far less money than you could with the edit. In the future I'm going with the LS1 edit though.
I have friends that bought the Predator and quickly out grew it. I let them play around with my HP Tuner and now they all have it. I have also seen LS1 edit fry some computers at a dyno day event. HPT is guaranteed not to do that. LS1 edit is not. That is the main reason I bought it.