I've been playing with a tiny85 and arduinoisp as well, so far it has worked perfectly for me, I'm very happy with it!
THANK YOU to coding badly for the attiny85 support, and to whoever it was that wrote arduinoisp, too!
So far the only issue I've had was forgetting to set the board type to/from attiny85 (well that and sticking my BBB into the breadboard one pin too far to the right, that didn't work well either :P), other then that it's been problem-free.