Had a 1090 / 1190 / 1290 and covered 50,000 miles on them with no major issues, a code reset and fuel guage sender (they all do that sir)
Mate stuck 70k on an early 1190.
Big KTM's are generally OK, electrics just too much to go worng, but saying that, they are all the same, mates GS1250 shat itself in France this year, under 2 years old and lowish miles, gave error for ABS / TC / Cruise Control, indicators stopped working and fromt light going mental, message on dash saying "do not stop engine as it may not start again" (althought luckily it did) dealer in France reset codes and told us "it might get to Calais" - which it did, but all the warnings came back in no time!
The concerns with KTM now are lack of dealers, historically less than stellar customer service when something does go wrong, potential issues with parts availability, but offset that with the cost differential between KTM and BMW / Ducati and they are a bloody bargain if you don't get a Friday afternoon special.
My 1290 Adventure was 7 years old this month, paid £13,100 (ignoring luggage and Akra I got second hand) and WBAB just offered me £5300 for it, £8k for 7 years, or £92 per month.
Not sure how good they are on PCP as residuals are lower than BMW / Triumph / Ducati, but if you swap bikes every 3 years it's a good way to "de-risk" the situation, but with a good discount I would buy one and if nervous then flog it a few months before warranty expires (4 years now)