I agree with John. I have an SB-30 and find it very easy to use. Excellent engineering. Wouldn't like to do without it.
One thing to be aware of: when you screw the SB-30 or 66 all the way on to the 5/8-27 thread of a mic stand it will probably inhibit the rotation of the bar. Solution is to either use a locking ring, or two opposing 5/8-27 thread adapters to give just that little bit of extra space (a thread adapter is included with the SB-30). I use a Manfrotto 1004BAC stand which has a 3/8-16 thread, so the thread adapter included with the SB-30 does the trick.
Perhaps in dark(-ish) setup situations you could pack one of those small LED flashlights? I have on that is about two inches long and about 1/2 an inch in diameter. Very convenient for lots of dark situations.
Anyway, I intend to get the SB-66 bar for my SB-30 at some point in the future.
Regards, Christine