The only bad thing about LUS A321 is lack of power outlets. Otherwise, its "F" seat is more comfortable than any domestic "F" seat I've seen on UA or AA (obviously, I'm not talking about A321T or any int'l widebodies on domestic routes).
The older F seat prior to HP merger is pretty good, lots of padding; the newer LUS F seat is just plain awful. I'd take any F seat in the LAA fleet over the latter.