reliability of -535 is excellent, far better than -22B (but can't be much worse (from -22B's era!)).
Only tip is that during start up, 535 accelerates to what seems flight idle & then slows down to ground idle. This is due to power change over to the EEC (aircraft power used until engine dedicated altenator is on line) during the start sequence.
Minor point I know, but it may be worth sumfing.