I've been using Clindoxyl (1% clindamycin + 5% BP) for about 6 years as a spot treatment, but after discovering acne.org I've been using it consistently in problem areas for about 2 weeks while I wait for Dan's products to arrive. I've always found the clindoxyl to be effective at treating active pimples by reducing inflammation, etc, when the clindamycin is still 'fresh' (it expires after 60 days), but as the product ages I'm mostly left with BP. I don't feel that the antibiotic on its own could be effective in preventing acne, like the BP. I think the drying/peeling nature of BP is what makes it effective in preventing acne.

I guess I should also mention that the 5% BP is definitely too strong for my skin for consistent twice-daily use, so I'm looking forward to trying the 2.5%.

I know this isn't quite what you're looking for, but I hope it helps!