My only personal experience has been with their NP3 finish on a lightweight Commander and Lightweight Officer model Colt in 1995.
These are my daily carry guns, occasionally Mexican style, sans holster. The finishes are excellent and have held up quite well.
I have seen their Glock grip reduction work and it's first rate, if that's what you're looking for.
Rich
[This message has been edited by Rich Lucibella (edited 02-01-99).]