Pretty good! The very recent update was massive.

I don't have any problems with mine. It was just updated
not too long ago as well.

For me it answers what i need it to be . Good enough and i encountered no bug yet .

Depending on which Roku you have (and what you'll be watching) you should definitely enable the subtitle burn-in for at least all complex formats. You can do that in the user settings in the web interface.

Everything else works just fine

Mine doesn't handle forced subtitles right or something. But I haven't started trying to tweak it yet. But when I watch like "invasion". It struggles during the Japanese scenes. The subtitles get out of sync and then eventually stop showing up all in one episode. Someone else mentioned something that might be the same and a trick for it that I will try soon.

It was pretty decent before the most recent update, now it's great!

Anecdotally it also seems very quick and responsive in comparison to commercial streaming apps (including Plex, which at this point I also consider a commercial streaming app). I don't know how much of that is the app, and how much is that my Jellyfin setup is local but regardless, it's nice.

i have a roku express from like 2015 with only a 2.4ghz antenna and it is exactly what i want. for a bit it didnt update custom artwork and subtitles would not be on by default but both of those are straightened out now.

I think it’s pretty decent, especially after the update last month. The one thing I find annoying is the way the search is set up (it’s hidden in the options button, but you have to be at the front page). Other than that, it’s pretty wonderful.

buy a ONN box from Walmart, it's only $20 and has Google TV