I have the 2001 Sunsport, which is the Launch SS without launch graphics. It has an excellent ski wake, and IMO a very good wakeboard wake. I ski some in a ski club that uses a Malibu Response, and I don't see a great deal of difference at my level (15 off). The Supra ski wake is larger since it is a bigger boat, but the wake is soft and easy to cross.
I met some guys last year that love to slalom behind their regular Launch too, but I think the SS is known as a better slalom hull. No mechanical problems with either of these models that I have heard of. Supra is a great company and you can buy with confidence.