steveo3002- I've pretty much talked them to death on a number of threads. Yeah, a *good* one will work fine, at least if used properly (which IMO means with a foamgun). Used *improperly* they'll cause about as much marring as a mitt IMO, so technique is important.
I do the initial pass(es) with the BHB then do a final pass (or two) with mitts. All with the foamgun.
For *very* dirty cars (think "winter dirty") the BHB/foamgun approach, to get the worst of the [stuff] off, is the only way I can wash without marring. But there's no way to over-emphasize that you gotta do it right.
The general idea is to:
-barely contact the panels with the brush, no hard pressure
-shoot the suds from the foamgun through the bristles of the brush so [stuff] gets gently dislodged from the surface and flushed away
-"jiggle" the brush instead of making long sweeps with it; a 1/4" long scratch won't show like a 4" long scratch will
I also use small BHBs from Griot's (pn 15520) to do nooks and crannies and yeah, BHBs made for wheels work great.
The ones for nooks and crannies last me maybe a year. The ones for wheels don't last as long, at least before they start to really get worn and shed bristles. The "regular" ones last forever but you need to inspect the tips of the bristles to see if the flagged/split tips are wearing. I replace them if the tips get worn and I CD-test from time to time because the "wearing out" happens so gradually that I can't always tell until the paint gets marred. Oddly enough some BHBs don't seem to wear much at all; FWIW, the best one I have (which I only use on my "good" cars) is around 20 years old and came from the now-defunct Beverly Hills Motoring Accessories, but the ones I use on my "regular" cars get replaced about every 2-3 years.
There are slightly different types, I have ones from Griot's (kinda short bristles) and AutoGeek (longer bristles) and each has its pros/cons so I use both types. I keep thinking I oughta get one of the TOL ones just to compare...