Well, I certainly don't want to become the NEW brush Nazi! ;-) If you've tried both and prefer the Last, fine. I only know that, having tried both the Last brushes and the DD ones, the DD's work substantially better for me.
I do still use the Last brushes, for the first RRL Deep Clean on notably soiled records. I follow up with a Deep(er) Clean using DD brush #1. This keeps the DD brush from getting soiled too quickly. Since the DD pads are replaceable and I have plenty of spares, I'm not really worried about contamination. It's easily prevented.
As usual, YBMV.
I do still use the Last brushes, for the first RRL Deep Clean on notably soiled records. I follow up with a Deep(er) Clean using DD brush #1. This keeps the DD brush from getting soiled too quickly. Since the DD pads are replaceable and I have plenty of spares, I'm not really worried about contamination. It's easily prevented.
As usual, YBMV.