Amazing the amount of press this subject has created, obviously it's well known the problems of these engines. I also note a Jab 4 sale on Ebay with a little over 400 hrs assuming from new & has had all the cylinders replaced already.
If I owned a new Lyc or Conty that needed that sort of heavy maint then I'd be worried!
This thread does make for rather in depth reading with some very in depth knowledge kicking about
Wmk2