The few installation hiccups you may have read in the forum have all been the result of non standard pickup cavities in guitars-this is quite unusual and the majority of guitars are routed with a full depth pickup cavity so won't cause any problems.
+1 ... I almost made a big f'n mistake in assuming that the nickel covered pup would fit in the rout for my Kamikaze. It fits, just barely, but that was my own f'n mistake.
The BKs come with more, and clearer, documentation + ancillary stuff than I've ever seen. Plus, Tim's active on the forum ... if you have a Q you will get an answer straight from the horses's mouth. (For the time being, anyway ;) )