Von Reddit
At the moment the main things that are different are
1) pistols are way more powerful
2) positional footstep sound is a bit strange unless you use surround speakers
3) wall penetration is different for guns
4) takes more body hits to kill people than css
5) Molotov's can change a the game quite a bit by using them defensively to block parts of the map off or alowing you to make a get away if you know people are coming for you.
6) smoke grays out your screen when you walk through it ( ontop of the smoke sprite effect) so you are very vunrable when you walk through it sumone will see you in the smoke from a distance before you can see them when you come through and out the smoke.
7) in general it seems the pistols are slightly OP the DE is not as good as the source or CS1.4 DE.

the bots are retarded they basicly have a timer on them and when that gets to 0 they 100% aim at you and shoot you then depending on there skill level they are set at they will get leg arm body or head , and the harder the setting the lower the time before they shoot is.
9) I think there are some strange latency issues at the moment , for example you can get a head shot sometimes then the person will die 1 second after you made the shot
10) there is a delay between when you kill people and it shows on the top right as a kill so it can be hard to know when to move onto the next target when you get an ambiguous kill