As I haven't bought anything from the new BD website, I'm not in a position to compare it with Am*z*n, except to say that it probably doesn't try to force you into buying Prime/strings/plectrums. There could be some pre-filtering done from drop-downs on the main menu. The filtering is comprehensive, which is good.
It's by no means perfect, but it's a far better look than the old website and at least as usable. I used to look at the used 5-string basses - that's handy, I can do exactly that now. It would be an improvement to be able to click on the pictures as well as the names to show the details. I also think that if you use the hierarchy display line to go back a level or two, all the filters should be shown with their current selections.