Spent 11 years with RJ85/100, as aircraft engineer on line maintenance. Then 1,5year more on heavy maintenance with these beasts. Need to say it was good time, not easy but gave loads of experience because this aircraft is not "reset and go"-type of machine. After all it was not that bad aircraft from maintenance point of view, but you need to know it or it will bite you and it is not helping you much when trying to troubleshoot some weird symptom...
Engines were bad at the beginning. I was one of the boroscoping guy on our company and at some point with our total 11 aircraft fleet i was doing inspections after inspection and very often you drop the engine. Later on Honeywell get biggest problems fixed and life was much easier. (better combustion chamber, oil consumtion/oil leaks fixed by changing oil type to better type which didn't cook hot end bearings/seals -> oil problem moved to auxialiary gearbox but this was piece of cake if you compare it to eng change)
They were newer problem free, but ok-ish. Eng change for this aircraft is actually very easy and quick, if you have built ready engine to go in.
Fuel system is very sensitive to icing and FQIS suffers contamination. Lots of work with fuel tanks, at some point our hangar was smelling more kerosene than fuelling company.
Landing gear position indication system/WOW, very bad quality proximity switches with too sensitive system... this was another huge workload before Eldec managed to get those switches to work relatively well. After many years...
One may think it is awful aircraft to maintain, but as said earlier, have a good team of competent guys and it will work.
Still missing those noisy brake fans.