I'm using it and I have to say I really like it. I've recommended it to a few people. The fact that it is free is a big bonus and I think it'll be good for getting a large user base behind it... good for tutorials etc... theres already plenty on youtube. My opinion pretty much matches this guy on https://youtu.be/o-GBpUZ3piY First part is a tutorial... skip to around 12:30 to see what he says if anyone is interested.

There was rumours of 5 axis machining being added, but the more I actually use my machine the more I realise I only really need 2.5d. So far anyway.

Also, I think its the only combined CAD/CAM package that works on a Mac, which won me over on pretty much that alone.