My dealer steered me away from the Zyx line to the Shelter because I prefer warm/lush.
Xagwell, if you asked your dealer for warm/lush, neither the Shelter 901 nor a ZYX was an appropriate recommendation. I own a 901 and I've owned multiple ZYX's. None of them is warm/lush. If you asked your dealer for warm/lush he should have recommended Grado, Benz, Koetsu, Allaerts, Miyabi, etc.
It's good that you enjoy what he recommended but you were misled about the sonics. I'd be inclined to ponder the possible reasons behind such a recommendation. One hopes ignorance played a larger role than willful misguidance based on some other motive.
FWIW, ZYX's aren't sold through dealers. They're sold direct by the US importer, with a discount that in effect lets the buyer keep a dealer's normal markup. For this reason, few dealers will recommend a ZYX (unless, like AudioFeil, they're more interested in being honest about what they hear than in making a sale).