I didn't use the XLT, but I used the Dual Frequency XLT---the DFX. I think that almost all of the features are the same except for the ones that require two frequencies instead of the one 6.59 kHz transmitted by the XLT. I absolutely loved my DFX--and the guy who bought it from me seems to have the same appreciation for it already.
IMHO, you can't go wrong with White's--they've got **the best** customer service--I don't think any member here on the forum would have a bad word to say about them...no exaggeration.
Their detectors, while a little on the heavy side, are durable, awesome machines with stellar performance and versatility, once you learn how to use them(the XLT, DFX, VX3, and V3i all have quite a few settings to be able to adjust).
I could ramble on about all kinds of stuff, but you get the picture.
Personally, I think the XLT, in decent condition, is definitely worth it, especially if you get extra coils. Check out *sold* listings of XLTs on ebay and you'll see what I mean.
Good luck with your decision! Hope this little bit of info helps.
