me too - especially because you get HFS+
Me three--bug fixes and HFS+.
I can't remember if it made any difference in battery life...it was OS 8.6 that first seemed to show real improvement with that.
With an old 68k Powerbook, I imagine the real question is, do you have enough RAM to make the upgrade to a more RAM-hogging OS worth it.
In the old days, when I was thrilled to get an 8MB RAM upgrade for $200, the answer was no...I would have stuck with OS 7.6.1. Today, I am assuming you have the RAM maxed out, and that is an academic discussion.