We also had a 2012 Volt previously and although I liked a lot of things about it, there were many annoyances.
- We owned it for almost 2 years and had to go to the dealership 5 times with various issues from the shifter actually breaking, wheel bearings failing, or interior pieces falling off/breaking
- The interior design, although much better than most chevy's, was annoying for my wife - specifically all the chrome trim pieces that frequently blinded her when driving in the sun
- The car was only a 4 seater (I know the newer ones claim to be 5 seater but with that cup holder between your legs, it's not really a comfortable 5 seater at all)
- Dealing with Chevy's service department was a pain - in the beginning, when the Volt was still somewhat rare, we were treated very well at the dealerships, but as time went on, the service went down hill fast
- No power seats! I know this may be a small issue but for me and the wife who are considerably different heights, it's a pain to try and get the seats adjusted back to how I need after the wife used the car (and vice versa)
Now I should say, there are still items on the MS that bug me too such as:
- Cheap floor mats that are barely holding up after a year of use
- poor assembly of body parts and interior parts - we had some misaligned doors that were fixed but inside the car, I still have issues such as the A pillar panel continuing to come loose, wires exposed under door panel where the lighting is, dash trim pieces misaligned, etc
- as some have mentioned, inability to have text messages read
- lack of customization of apps - with that massive screen, I wish Tesla had an 'app store' to add additional approved apps like how Apple/iTunes does.
But regardless, I prefer the MS over the Volt (no surprise there considering the price point). I never once missed the Volt. Right now I'm driving our Audi A3 TDI everyday until we return it (from the diesel scandal) since the buy back amount won't change. I have to say, I've missed driving the MS.