Ian V.wrote a review of Brooks England End Caps w/Logo - 1 Pair on March 6, 2011
They're a classy finishing touch for the already classy Brooks leather bar tape, but don't expect them to last long. People (mostly drunk girls) will pull them out while you're not looking. I know this because it's happened 3 times to me already. My first pair came packed in with the leather bar tape, and I've purchased the other two sets from here and my LBS. I'm considering smacking champagne corks into my bar ends with a rubber mallet but hey, they're just a few extra bucks on this site if you're buying some other gear.
Oh yeah, I recommend soaking them in olive oil for a day or so before plugging them in. It keeps them from getting brittle, drying, and cracking.