(1) VX Clubhouse a lot of dough - never used it.
(2) T4 PP lounge has been "acceptable enough" although I think it is on a downhill slide.
(3) I always liked the compactness of T7. Back when UA had a big operation there (almost all of T7 and part of T6), it made for very easy connections, and very quick security-to-gate.
(4) With Precheck and perhaps an airside bus to/from T7, I wouldn't find much downside with this..