They are meant to be better built these days, although quality and comfort is not on Lexus level. I've not heard so many issues on the Tesla FB group. Since they've been built in China they've been better quality (than the US ones).
Some things to be aware of:
They no longer come with indicator stalks. These have been replaced with buttons and I've heard mix reviews from owners from "not as good as stalks but you get used to them" to " my wife hates them and won't drive the car". The buttons aren't so great on roundabouts as they obviously move with the steering wheel. Some people have complained that they need a firm push or pushing in the right place. Best have a test drive and see what you think.
Parking sensors have been removed and now the cameras are used to give a rough idea of obstacles. The front camera is at the top of the windscreen so accuracy at the front is not great.
Auto-windscreen wipers can be a bit hit and miss as they use the cameras again instead of proper sensors. I've found mine work pretty well recently. The over the air updates do mean things like this should improve over time, although you get the occasional bug.
Auto-steer on the motorway is great, when it works which is most of the time. Occassionally it will try to steer you off a slip road if the road markings are worn. You can just use adaptive cruise control without it though.
Customer service is variable and nothing like Lexus standard. eg Rangers fixing the car on your drive is great but I've had an issue where it took multiple appointments because they didn't have the part, had the wrong part etc.
Efficiency, range, performance and charge speed are all excellent as is the charging network and the cars have a CCS plug like every other modern EV except for the UX 300e. Dog mode is very useful if you have a dog (or child)