I have played space engineers since it started in EA, switched to EGS for the last six months or so. I like both games but for different reasons, building in SE is great but the multiplayer is limited. EGS has great multiplayer but in small limited servers and the building is great but there's a lot to be fleshed out there.
This looks to me like a game I can get lost in for a year or two. I have just found it as a result of a post in a forum for EGS, decided to have a look and from the very limited exposure I've had through the vids it looks incredible. I am really looking forward to playing