Got to test one back in 2021 to make sure it functioned (first with the in-built MineStorm and again with Berzerk).
It truly is an interesting piece of work, due to the vector rendering, but in a greater scope of things, it suffers from the core issues I see with the second generation; the games were largely arcade ports or were in that style. You've pretty much seen everything there is to the games within 15 minutes, and a full session of playtime wouldn't last an hour. But then again, that was standard fare, for the time.
I still put it as my second-favorite 2nd-Gen system. It's hard to beat the 2600 with some of its more advanced games (like the stuff on Supercharger).