Yeah, that was the biggest drawback to the process. Thankfully I don't have any System 6-specific programs. I do like 7.1 though but if those moments of true nostalgia hit I guess I'll have to swap out the parts again. (Not a big deal, really, as it gave me something to do on a free evening--we had a major snow/ice storm up here in Pennsylvania today so my college called off).
I did encounter one minor glitch at first, which was the speed--it was too fast! I had to get out my 7.1 install disks and grab the Cache Switch control panel--I never thought I'd say my LC was running too fast!