Heyyo,
Well, I think it's the bot that appeared in the early stages of CS 1.6 wasn't it? so it's more like the beta of the CSbot. I believe they released it with CS 1.6 for a few patches to see how well it could play online against other players n' the likes, so it was more of an open-beta testing...
When I 1st got steam n' tried it out it was pretty good (took FOREVER to finally get cs 1.6 downloaded to my comp... you think steam's crap now, you should've seen it when they diddn't have enough servers to support just northern america itself and had to shut down steam for a while to get more servers
), if you search nuclearbox you can find a detailed description on how well the bot did things. One key feature was its ability to autowaypoint, that was cool.
Just like other bots, in how people rate bots to bots it's more of personal opinion. I think it's great, but would take PODbotmm or YAPB or E[POD]bot over it anyday cause yeah, zbot's not supposed to be around anymore cause the beta-testing period for it is done, n' it kindof lacks the charm of a good PODbot. I'mma PODbotter.