well, I run both OS3.9 and OS4 but I have to admit I dont like 4.0 much.. I intend to buy 4.1 some day to give it another try. OS3.9 is just so much more fun to tweak and play around with. Its much more responsive and compatible with legacy software. Also, I love my hardware setup, quite hard to setup initially but once you get it going its a great machine that really is the most Amiga-like, Amiga-compatible machine you can get. I can even turn off the blizzppc by holding down '2' and I will have a standard a1200 again, able to run even more old software. But in the end I guess we all have our own reason to like or dislike OS3.9 / OS4.x.
