The layout is impossible, but the feeling is exquisite.
The AT layout is much better, and when I get mine back out of storage and re-jigger the Enter\Backspace area to modern standards, it will be tolerable. But they were already cutting costs with the AT, with the plastic case and all.
The XT is a must-have for a serious keyboard collection, if you are a collector, but I doubt that one person in a thousand would want to actually use it on a regular basis.