Just flew seat 21A onboard N804UA for the long haul ORD-SAN. It was one of the best experiences I've had in Y, and I'm a bigger guy. IMO it's much better then the bulkhead - the bulkhead doesn't go down to the bottom, but your view is of the bulkhead itself, and no tray table for the bulkhead.
The exit row was spacious, and had a tray table, and was a great seat for the 3.5 hour trip.
I don't usually fly the 319 due to upgrade chances, but I will not hesitate to get on this plane again if I can confirm that seat.