This provided a nice couple of action packed evenings. I don't play a lot of HL these days but a friend of mine pointed me to this and then I saw this thread. I found myself staring at all that eye-candy (for HL standards, at least). Really loved some areas, like the metro station, that glass-tunnel area where some jets keep passing by etc. It made me realize, more than the original HL, just how massive is the Black Mesa complex.
The difficulty was well balanced I think, I did have some frustrating moments but eventually got through them. The attention to detail actually became annoying at some point, in the positive sense (made me shout "what the heck, did this guy really just spend all that time for this?). I think the amount of time that went into this is obscene by my standards, but with sacrifices comes good quality things.
What can I say. It's 2018 and I'm more impressed by a mod for a 20 year-old game than AAA titles - probably because I realize just how much effort went into this.