Have been using NixOS as my sole os for a month or so and have zero complaints
It will quite frequently make installing and configuring things that could otherwise be a nightmare on other distros absolutely effortless (to switch DE you change one line of code, for instance)
On occasion however it makes things harder than other distros because you can’t really apply stack overflow questions, differentiation etc for other distros to it as well
Generally speaking 90% of what I’ve wanted to do with it has had a built in option or package that was a one or two line change to a file and a command to rebuild
Also, as long as you install steam via the built in option gaming works perfectly on it for me