Electrostat - M-L; Quad or Soundlab - reliable

I 2nd the acoustat reliability

For most users, Quad panels last 15-20 years before requiring refurbishing. I do not consider that to be unreliable.

According to Roger Sander's the Innersound panels have never failed.

I am a soundlab m2 owner and have not had any reliability issues at all; my bias adjustment is checked on a regular basis and unplugged when not in use.

I have two sources of information re: Soundlab reliability.
1. Two of my friends have Soudlabs - M1 and M2. One had to ship his back for repair( the M1). They are now for sale.
2. Check the ads on Audiogon. A high proportion say; For sale, just back from the factory with .......
I strongly suspect that few pay to have their heavy expensive Soundlabs shipped back and THEN sell them, unless there was a problem. On the other hand, I have become a suspicious person (by starting out as a trusting one) .