Doesn't seem like any MES owners are going to help you. And I don't know if what I say will be of much help. From what I have read over the last year or so, it is a reliability issue. The Generation 1 apparently is more temperature stable and outlasts it's warranty. The Generation 2 per many posts is problematic. Some are heating issues, some are controller issues. And some had wiring issues. Not being a MES owner, I don't know if the wiring problem is related to the heating or the controller. I would think that by now the problems have been worked out, but I cannot qualify that that thought.
I don't know about the water pan size being a problem. I never use a water pan on any of my smokes (Cookshack) and neither does my brother (Smokin-it). Regardless of what you have (GEN 1, 2, etc), the AMNPS from AMAZEN is used by many (most?) to generate smoke rather than relying on the built in chip holder. The chip holder needs to be reloaded every 20 minutes or so. The AMNPS will smoke for hours on one loading.
If you use the search bar at the top for MES or Masterbuilt you should get some good information both pro and con on the various models of the MES. No electric smoker is going to be perfect; some just better than others and less of a headache. But as I stated earlier, the GEN 1 seems to be the one to go with. They have a Blue tooth model but I haven't seen too much on it.