There's another thread on here very similar,I agonised over a 690 SMCR I have a fair bit to do with the motorcycle trade and I certainly see some horror stories, in KTM's defence you can always see horror stories with other bikes but there ain't many KTM's out there by comparison and there's a LOT of hassle many I can confirm from personnel experience.

If you have the time and patience and e'rrr money then you will have a great time but if get to talk to guys who know how look after them an XT660 it ain't in more ways then one and that's both good and bad.