Yeah someone posted about it on here quite awhile ago, saying they were going to use it everyday to train aim(using head size), I think even use it to replace dm. My personal opinion on it is meh. I think it has its value as an actual warmup. For awhile now I only need it if its been a few days since I last played, I feel like my mouse/strafing control is really "cold", and in the mornings if no server really has people in it.
What he shows in the video is great to wake you up and get you used to moving your mouse a lot. Although I don't think it would make you better at popping heads, I guess that doesn't matter if you don't care about headshots. Usually I would do something like he did or do intensive with 12r and like .3 -.5 for a bit if I need to get my reactions/mouse going. For actual aim I would also do intensive with size 5/head and like .5 or .6. Never trained aim that much with classical.
Ugggghhh, lemme keep this short. I used to do this A LOT(ask some people I know), I mean all the time, and I noticed I got way better at aiming just doing dm/HSmod/aim maps than spending time doing this. I still think its a useful map though, I personally just have my doubts how much it actually improves your aim. You could probably do exactly as well as he did, yet never have nearly the same aiming ability. https://www.youtube.com/watch?v=t25nK9s-m_I
(k, for whatever reason it wont embed)
^Feel free to add for mm/altpug/10mans/anything else