It's decent considering it's free. Minor issues, need to have backup sites on hand, occasionally main feeds die and you need to watch in another language. There's full replays of races so if things are too bad you can avoid spoilers and watch the race right after it finishes.

For every site that offers streams there's like 50 copies with all kinds of sketchy url variations. They appear to mostly use the same feed, or have the same backbones. But when all the streams are frozen it's the 5th fake-looking site you visit that works. So if the main ones are frozen and it seems all the spam sites are the same, it might be worth scanning through them.

The sites can change too. I'm not in a discord or in communication with anyone so I just put in the effort to find a group of working sites and maintain my little collection as the season progresses.