Used M.Logans-What to look for?

I'm not certain what you mean by "what to look for." I assume you know what they sound like since you want to purchase them. I assume you know that you need ample space (at least 4 - 5 feet) behind them and no rack or equipment between them. I assume you know that electrostatics need a fair amount of power to sound their best. If you want to know what models to buy, I really like the Prodigees. You see them for sale here about 6 times a year for around $6K - $7K. If you are looking for smaller ML's, the Arius are really sweet too.

Look for dust. If you see a lot of dust on the speakers it could be a problem down the road. Look for pin holes potentialy poked by an animal or child. Otherwise the are pretty rugged.

If you are buying SL3 or reQuest make sure you check the binding posts. They have a tendency to get lose inside. It may not be a big deal if you know how to open up the back cover and tighten them.

Be aware that these are 4 ohm speakers that dip below 2 ohms at 20k. You need a good amp that's power is rated at nearly double the 4 ohm load as it is for 8 ohms.

The younger the panels, the better.

Dust, smoke, humidity and pollen are a factor. I failed to maintain my Aerius I's last spring and the output from the panels was reduced to virtually nil. I vacuumed them with a household vacuum cleaner and output improved a bit. Lived with that for a week and then pulled out the 4.5hp shop vac and they came back to life. This is recommended in the manual and by Jim Powers at M/L via email. "vacuum them. The stronger the better." They are extremely durable.

I love mine but be prepared to spend alot of time getting them positioned properly.

I had Sequel II's several years ago and while the panel sound was to die for the sluggish bass (in comparison) drove me nuts...so I sold them. Therefore, I'm told, get only the full range ML's like the CLS IIz...which are really the idea of stats in the first place. Better tuneful bass than out of whack 'bass'. OR, buy Quads!