I've used/use it. For a while it had one of the best lightweight coding LLM's, which actually lead to a #1 spot on openrouter usage ranking although they've fallen off the top 10 used now. It's also provided some good reasoning models, which perform better when dealing with non-PC topics.

Also, although I've never used it for this, I believe some of the paid models produce some of the best "adult" content, and I know there are even subreddits which do nothing but praise Grok and "content" produces who use it.

Tesla drivers, at least for a few minutes each day before hitting the limit.

Grok is the best for researching recent events and real-time information. All the other AIs have a learning date cut-off too far in the past.

Claude accuses me of hallucinating events that happened the day before, and it's quite annoying.

Grok is pretty good. It really excels when the results can be improved by deep online search. It tends to be more aggressive in looking things up than competitors. I use it in certain situations.