I had one of those elbows and they do still wear and leak, just in a different place. I've just gone back to the ordinary male but in hozelock pro with a brass female because it's got the ball bearings. Seems to run a lot smoother. I also smeared with vaseline.
It's on one of these reels: http://www.windowcleaningwarehouse.co.uk/shop/hose-reels/free-standing-microbore-hose-reel-100m.html