I wrote a number of programs with GRIP but when journaling came along I switched to that and have never missed GRIP. Unless you have a substantial number of old GRIP programs to maintain, I suggest moving to journaling.
With NX10, there's a new document called "SNAP and NX/Open for GRIP Users" or something like that. It should help you transition from GRIP to NX/Open (if that's what you want to do).