Ain't that the way of it?
Worthwhile for a TW freak who's committed to a lot of mods in the future. I have lots of XT stuff on mine.
Longer front brake hose, cables, longer kickstand, tank, larger front brake rotor (same bolt pattern), controls, shifter, most of the electrical components, safety switches, snail adjusters, bars, rear brake arm etc. all upgrades or a source of spares for TW's, particularly the early ones. The seat pan is handy for a seat graft if you're running an XT tank, etc.
I need a head for one. I'd buy that in a heartbeat.