The LUS 321s do vary a bit, with the newer ones having more space due to leg cutouts. The oldest ones tend to stay on short east coast hops due to range limitations (newer ones have more range). There is a lot of bashing of the LUS fleet, but the 321s are not THAT bad and the WiFi is a plus. The new transcon 321s are much better, but I do prefer the US 321s over say the AA md-80 first class due to seat width. The drop down IFE on the MD-80 is not needed when you have WiFi.