The Uptowns are VERY nice for the price (save for that nasty channel imbalance issue). They're a bit more fun-shaped tan the EFi-82 MTs, sonically speaking. The Uptownshave a hotter treble and boomier bass. After switching between the EFis and the Uptowns, the Uptowns sounded a bit "livelier", but also sort of slow and boomy. The EFis are easier to drive, also (and don't have that wretched volume controller that does nothing but cause channel imbalance).
I just had the strangest thought about what the Uptowns might sound like as open phones. Hm.