I have a 1979 cb750F and I love it. It isn't for eveyone though. Acceleration is all top end based, not much happens below 3000Rpm, then it comes on like a freight train. It floats the valves at about 500 rpm before redline, and if you beat on it hard expect the cam chain to go around $40K. Other than that I like the bike a lot, handles way better than my SOHC bikes. I have a corbin seat on mine and I highly recomend the $300+ investment really puts you in the bike instead of on top. If it weren't so big I would say it is the perfect commuter bike, but the bar end mirrors on mine make it hard to lane split. The later ones will take a wide tire, whiel the 79 Ihave is kinda locked into the skinny 130 it has. I also owned an 1100F at one point and I liked it alot. Pretty fast bike for an aircooled motor, I liked it but at the time I lived in New Orleans and the bike was too hot to ride on in the heat of summer. The factory carbs I hate more than 1978 cb750F carbs, they are a real pain in the arse. If it is in the budget get a real set of flatslides to replace the ugly hard to tune, finiky stockers. The 900 motor is a lot quicker than the 750 but the earlier ones were more delicate than the later ones. The cb750 motor may have been overbuilt but the 900 motor was not. Abuse will definatly cut it's life short. Still a fast bike and more kin to a modern sport bike than a SOHC, despite being the next generation.
The nice part about the supersports is that they are cheap to buy. I paid $360 for mine, and I could get nice running examples for $500-$1400 right now if I wanted to.