But seriously yes I found it fine.
They stream the fox games so it's the fox commentators you hear - led by Vonnie!
I believe they don't stream exactly live, as they're a few minutes behind fox itself - I found this out one night watching a game while WhatsApping with a few mates watching the same game & a couple of them reacted to a try before it happened on my screen.
Not sure why, a mate of mine reckons its something to do with fox being the owners therefore their cast is prioritised & 100% live while resellers should have a slightly delayed cast.
As for reliable, mine went down a couple of times during games (image just froze despite my internet working fine) but it was only for a few minutes except for one occasion, which was for about 20 minutes.