I voted yes, because I use the codes, but on Code Breaker. It is so much easyier to use and type in the codes. Now just wiating for someone to discover the hybrid base codes for GT3, and I'll get to work.
Using a Gameshark isn't cheating, however logging on to GTPlanet is! Just kidding. The coolest thing I've done with GT1 is to drive the 427 Corvette in Simulation Mode. Talk about a wild ride! Makes me smile just thinking about it.