Insanely relaxing and like my favorite game. I bought it on PC release and played the heck out of it. I have the multiplayer version... but I played it so much that I need a longer break before I give that a try.
I have 1,697 hours on record... but I'm p sure 2/3rds of that is from when I would leave it running for weeks at a time in the background on my desktop computer.