Yeah, I hit 48 and brought my 4 clothies (priest/mage/mage/lock) to BRD with my 70 Warrior. Boosting in there seems alright. I'm actually using my clothies to DPS and heal now, which I didn't have to do in any earlier instance. It definitely seems slower than before, but the levels get longer as you go along anyways.

I can't quite do even half of BRD yet, because when the mobs are above 52, my DPS guys can't do enough damage (all the misses) and my healer pulls aggro way too much. I'm about to ding 49, and its taken maybe 3 hours? Not too shabby. Getting lots of runecloth and blues though.