I have the first generation and they were too heavy and tend to fall out of the ears. I hate them. The right ear piece on the second generation squeals like a microphone test just before a speech so it is useless, all because I dropped it one too many times. For the price of a replacement piece, I decided to get the third generation pair - got them in white.
Just because it is cheaper does not mean it has bad sound. It is actually pretty good for what I listen to. There is no noise cancellation, and I don't miss it. There is only a one size fit all silicone tip cover already on the earpieces with a spare. I wear them when the echo frames are charging or when wearing prescription glasses. What I like is they do not stand out as much when wearing them and seem to be lighter and have a tighter grip. You do not need to jam it down the ear canal to keep from falling out. The case is much flatter and a bit smaller than the others. Unfortunately, it is not wireless charging.
No problems giving them echo commands, got them all right the first time - so far. It was extremely easy to set up. No regrets so far and would highly recommend them.