For me, not buggy in the least. For over a year, I've used it with 10.3.x on Blue and White G3/350 and G4/400 towers for use as kiosk computers for new university students to get to an email registration page, and it works like a charm. I have not tested it with Tiger - and have no need to, at this point. The only time these machines are down is when I have to replace a PRAM battery.