To add another anecdote, I've had a .is domain from ISNIC for about 4-5 years now and have had no problems with them during that time.

I built a music "scrobbling" program called rescrobbled to submit music I listen to Last.fm. I was sharing a Spotify account so I couldn't use Last.fm's Spotify integration -- which is pretty bad anyway, in my experience. Rescrobbled has served me well (and a few other people too, apparently).

https://github.com/InputUsername/rescrobbled

Psyonix recently added a "Rocket ID" feature which allows you to add people as friends and party up cross platform.