The difference between the Grandi brush and this one we're talking about is it is stiffer and about an inch wide, not just one row of bristles, which I've found just isn't stiff enough to do the job.
I've never seen the white one but the black one works extremely well for agitating prespray, pushing it both ways, esp on soft berber. Don't know how many times the client came in and said the carpet looked that much better and all I had done to that point was vacuum, prespray and groom! Blew me away one day when they said it looked better than the last cleaner had gotten it! :shock:
For a finishing brush, by pulling back only, you can leave the carpet looking like it was freshly laid, no teeth marks.
I bought one for prespray and one for finishing. Now its a no-brainer at $20 each when my min is $150, but 7 yrs ago it was a $100 investment when my min was $90! But they sure last well.
BTW, I've got 2 GGs here if anyone wants them, just taking up space. One needs a handle.