Assume that you can buy these two speakers for similar prices, what would sound musically more coherent and long term satisfying. The older Wilson's have always been thought of somewhat sterile and lean, where the new WP7 seems to be a lot more musical.
I remember reading a rewview ofa wilson speaker a while ago..the reviewer mentioned that the current watt/puppy 7 was vastly better in every way (except obviously bass extension) than the original grand slamm
also, fwiw, if you're a tweaker, the X-1s are probably out of warranty, which makes them an open target for user upgrades (a part here, a part there---and yes, i've not seen one speaker > 5yrs old that couldn't use a few parts).
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