UPDATE- A little while ago
swanicyouth pointed out that the "Montana" BHBs (from AutoGeek) that I like are apparently made by Universal Brush, and that they also offer a "Premium", supposedly better, "Blonde" BHB line (link:
Universal Brush ).
I ordered up a pair of their #UB-702 12" Blonde Boar Brushes, at ~$70 each.
The ones I got had a different color handle from the ones on the website, in case that diff gives somebody pause (i.e., don't worry, it's the right one).
I CD-tested them and they passed easily, even when I pressed harder than I would like to do in real car-wash use. There was no excess adhesive at the base of the bristles (which can break off, get pressed against the paint, and thus cause marring). These are *VERY* nice BHBs and may well become my new favorites.
I can't tell if they're really *softer* than the "Montana" ones (which I believe are the ones on this page-
Universal Brush ), but they're not *SO* soft as to be too gentle for practical use. (But the usual "BHBs are too gentle to get things perfectly clean all by themselves" caveat definitely applies.) There are a few "non-blonde"/dark hairs mixed in with the light-colored ones, but I don't care about that as I don't think it really matters.
I washed the (admittedly not-too-dirty) S8 with them, and they worked fine. Plenty of flow/flushing through the bristles from the foamgun and enough surface agitation to get "the big stuff" off, though I'll have to try them on a truly dirty vehicle before I can determine whether they'll become my go-to BHBs for other, less pampered, vehicles.
So whether they're actually *better*, in a functional sense, than the "Montanas", eh...I can't really say and if I had to guess I'd say "no". So unless you're washing stupid-soft clear I suppose most people oughta probably save their money and buy the cheaper (non-blonde) ones.
All-in-all, the BHBs from Universal Brush are now my short answer to the "which BHB?" question. Thanks again to
swanicyouth for motivating me to check them out!