hi martyn, i cant say anything about the krone bailer as i have never used one,
but for the last 21 years we have had the same rp200 baler, we bail around 2500 straw, hay, and silage of our own with it and about 1000 for a neighbor and sometimes a few more hear or their that cant get their usual contractors in, it will follow and pretty much keep up with a 30 foot combine in fairly long straw, on the occasion it breaks a bail i have roughly pushed the broken bail out with the loader and bailed it back up without to much hassle, it seem to eat anything!,
I'm not saying it never blocks it has sometimes but the handy spanner that, if it is still with the one your buying on the tow frame, to reverse the reel on the bolt under the flap on the right hand side where you put the reel wheel onto, Usually loosening this back then turning the pto back on it pulls most blockages through, ...As for mechanical faults, touch wood, as we still have this one!, we have had the odd problem that the knife that cuts the net hasn't come fully back, after releasing a bail out the back so when you go to wrap the next bail the net wont start, (this needed a new spring, £12 and easy to fit),
another occasion it started slipping the odd bail(not wrapping it)this was due to the rollers having warn off all its paint and the straw couldn't grip, some paint from the local dealer and this was fixed. we hope to renew it this year and would stay with a welger, we have had a few different models over the years and none have been a patch on this machine. hope this helps in some way