here's my list since 1971:
1 hammond b3 with four leslies and a bass
amp system
1. rhodes piano
1. moog
1. string machine
1. wurlitzer electric piano
regarding the above except for tubes and minor
tuning on the pianos, no problems for 18 years.
2 roland d20=14 years with no problems
1 roland a30 with korg i5m= 7 years no
problems
3 korg pa80's and 1 pa60 less than 2 sets
each before breakdown.