The cold starting problems with the Lithium Phosphate batteries will keep me away from them. To me the weight savings is not worth the trouble of trying and possibly not being able to start the bike after a cold night of camping in the mountains.
Normally I'm all about technology, but this still needs more development before I'd ever buy one. If I lived in Phoenix or Tucson I'd have one in a heartbeat though.
"All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost."
'12 690 Enduro
// 690 Wiki