I've used a LONG Hive w/ a mix of Langs for several years now. Its the best of both worlds IMO. I like them both and only use mediums (supers/frames). My current Long Hive colony (a 2011-12 winter survivor) has swarmed twice this season, both were caught and all three are booming right along with my other hives.
For me, the best part of having both types is the flexibility it offers to the beekeeper.
I use follower boards as well, with a 1/4 " hole drilled into them which can be blocked, to place feed on the other side. Must make them tight fitting to prevent bees from entering but you always loose a few.
Have fun with your LONG Hive, they can be a joy to work, just different.