Quoted from WesleyCowan:The very used Pinbot I owned for 7 years had many issues over the years and sometimes I was afraid to turn it on to find out what had gone wrong since I last played it. However with much help from LTG, RGP and later Pinside eventually got it working well.
On the opposite end my RBION was very solid and had no problems with it. Wish I hadn't sold it.
Current pin has been Maverick because of the optos get out of alignment easily and some other issues. Still it's fun (when working).
My RBION was finnicky with the optos, they'd get a bit of dust on them and start going off when they shouldn't. Never any major problems though just needed some closer attention than others.