Electrostat - M-L; Quad or Soundlab - reliable

I can attest to the reliability of the Innersounds. The stats are practically bulletproof. No arcing, no issues with dust or humidity. Yes, Innersound has closed it's doors, but Roger Sanders is in Colorado, and very willing to help you out, if a problem arises. The Innersound Kaya's have dynamics that will completely blow away any of the other speakers that you are considering.
There is a pair currently for sale on Audiogon, that is a steal.
If electrostats are what you are looking for, I highly recommend considering these. I have had mine for about six months, and for the first time in my audiophile career, I can say that I am done. There, I said it.

Some production runs of older-generation SoundLabs had problems with some of the materials used that would not show up in testing, but could show up later. Current generation SoundLabs have been highly reliable to the best of my knowledge, as long as they have not been damaged in shipping. In my experience, reliability issues in older SoundLabs can often be traced to improper packing when a used pair is sold and shipped to a new owner. The new PX panels are much more rigid and less likely to be damaged in shipping, but they are not totally drop-proof nor forklift-proof.

I don't think it's my place to post specifics about changes in manufacturing techniques on the internet, when SoundLab hasn't posted those changes on their website. But I invite anyone concerned about the reliability of current-generation SoundLabs to give me a call - my phone numbers are on my website, audiokinesis.com.

Duke
dealer/manufacturer

I am 3rd in line with Acoustat. I bought my Spectra 33's in 1988. They have been driven by B&K, Counterpoint, Krell and VTL and never needed repairs. They are now used part time but once a year they are up a running for a few months. I'll never get rid of them.

Make me fourth in line for the Acoustat's. I have the nice wide 3's and they are old and perfect sounding.

I have lived with stators all my life. Started with the Quad 57s, had Servo Statics, Quad 63s, Accoustats, InnerSounds and live now with Sound Labs. I have NEVER had reliability issues. OK, I blew a few panels of the 57, when I listend too loud and that was all. In my experience the Accoustats never even came close to the resolving power of the 63s, but they played louder and had more dynamics. Same for the InnerSounds. Concerning Sound Labs, I think Duke has said it all.