In reply to Alun:
An alternative view:
The town is a dive
29 Palms is a genuine Ameriacn small town with its share of drop outs, single moms, tweakers and the flotsam and jetsam of American society. Moab is a destination town full of poncy hippies extolling the virtues of micro-brewiers and early morning yoga.
the climbing is similar to the Peak District in style and appearance
Well yes, the rock is brown... but J-Tree, whilst mostly single pitch, is full of long, sustained lines which make Millstone look like a scruffy hole in the ground and its routes two-move wonders. Sure, there's a Brimham-esque quality to the place, but I'm not sure that's a bad thing. I found the routes at Red Rocks to be fairly samey affairs (I'd still go back there tho).
Having said that my next US trip would probably be to Moab as who can resist the lure of the planet's premier crack climbing destination?