Yea, all of the chain drives with the sub trans are a bit of a pain. I think most people replace the change with out touching the sprockets ever. If it needs them though, defo want to replace them as it kills a new chain pretty fast, I've done it before and couldn't figure out why the chain wasn't staying tight.
The 200ES also has reverse which is a nice perk. Besides that, they are very similar machines. I think the 200M I quite similar to the ES too but never owned one to really grasp exactly what's different.
Not to pitch my
parts or anything, but just so you're aware, I make aftermarket ignition switches for your machine, it should have a neutral light, so that sub harness/socket I can make, and I probably stock the whole machine's bulbs as a set if any are blown out. I also make a lot of adapters for people, so you could like remove the stock AUX plug on the front rack and mount up a normal 12v aux like a car has for better access to the 12v to run like GP, Cell charger, etc. Max draw is 15 amps, but only like 20w extra power with the lights on, 70w with lights off, but over 150w can be pulled, it just will drain the battery over time even with your riding it.