I played the 2012 release for at least a hundred hours, I got to know that game really really well. It was a pretty good game, I really liked the way the Xenians were handled, they did a good job carrying over and enhancing the 'mysterious' feel from HL1. Had some severe balance issues but still worth your time.
I'm still pissed they started charging for it. The original release stated that all future versions would be FREE, but they shamelessly backtracked on it. I don't care how much they've improved it, they made a fucking promise.