I wish the EBB was a good singlespeed solution, but I haven't found that to be the case. Sliding dropouts, on the other hand -- especially like those found on the Kona Unit (and other models) -- pretty much solve any and all issues regarding chain tensioning, disc brake alignment, and gear swapping. As a bonus, if you ever decide to run gears, you can slam the rear wheel all the way forward, shortening the wheelbase and making the bike a ton of fun.