With all due respect to Larry, I had one Hushy, and they were a bit of a disappointment in my humble opinion. Before I bought my "Roller Door" I'd already owned a Kawasaki Z1 and a couple of Suzuki GS1000's, which were the real "Heavy Hitters" of the 1970's Superbike era, and the Honda never really measured up to either of them in mechanical strength or sheer grunt, and had few successes against them on the track, or in the showroom.
They had a really complicated cam chain setup with 2 separate chains and tensioners, and camchain adjustment was difficult and often ignored by owners, so after a couple of years they were usually quite noisy mechanically. Also, they had a pretty weak bottom end and chewed out crank bearings and occasionally broke conrods. Their electrics were suspect, the ignition "black boxes" often melted, stranding their owners, and the OEM FVQ (which apparently stood for "Fade Very Quickly") shocks were rubbish. The brakes were average, they weren't particularly fast, and were prone to oil leaks.
All of the above means nothing of course if you really want one, one of the worst bikes ever built was the early Honda VF750's and VF1000's, but I know a couple of guys who've owned them and loved them, so just like love is blind, love of a particular motorcycle marque can be blind, deaf and.............. dumb. If you want it mate, go and get it, and enjoy! 
In my experience, while it is true that both Kawasaki and Suzuki made better bikes during that time, CB900F was not as bad as Terry makes it out to look
I've had many, (two were bought new) and many lived to a very ripe old age with me. I have not encountered the particular problems of oil leaks, burned out CDIs, broken rods, or bad crank journals. What I did see were bad alternator rotors, burned inside exhaust valves, somewhat troublesome gear changes (there is a pretty effective and cheap fix for that) poor high speed stability, and poor cold starts unless re-jetted. I had a very hard time starting both of my CB900Fs that were practically new at the time, at 5:30AM on colder, damp Bay Area mornings.
All that said, stock for stock, the CB900F IMHO has better suspension (forks in particular...39mm, filly bushed), stronger motor, and much better brakes, than SOHC 750. The alternator rotors do go bad as I already mentioned, but with the lights unplugged, the bike will still get you where you need to go if it is within 50-70 mi...just put a voltmeter on the bike to know when to unplug them. The melting CDIs were because of the poor epoxy, as I had some "melt" while in storage on the shelf
The only area of the motor that ever leaked in my experience, was the valve cover gasket and the valve cover bolt grommets that hardened quickly. If both are replaced during a valve adjustment, there is no problem.
BTW, on a CB900 you can replace the valve cover gasket (or do a complete top end) with the motor in the frame, unlike the SOHC CB750, which is a very nice feature. Ex.valves do need to be adjusted lose to not burn them.
