Yep, the one I tested was different, too. It was actually more CS 1.5 with support for the new items (Galil/Famas/Shield) and the new CS 1.6 models (player and weapons). That's about it. The new VGUI with rounded corners has not been included, and the zoom crosshair for Aug and Sig is still 1.5-style, too (i.e. tiny and yellow instead of normal).
In fact, the only reason why I got this version is because I don't play online anyway, but I test and waypoint new custom maps, and I want to test bots. And some recent maps come with features that don't show in 1.5, or rely on models / sprites etc. that are included in the CS 1.6 default maps, but not the 1.5 versions.
And of course, when I play against bots to test them, I like to have better models for players and weapons than the crappy default ones - and the best models around are for 1.6, not for 1.5. I know you can mirror & recompile them, but I just don't have the time or the nerve to do so.
All in all, I would prefer to have a well-running Steam 1.6 on my PC, but it just didn't work properly, and since I payed money for that game, I play it. If Valve don't get the job done, then I rely on someone else who does.
Oh, and the DSL problem, yeah... I can understand that. 10% of a month's salary? Holy shit, I wouldn't do that, either! In fact, even here in Germany it's not
that cheap unless you are a complete computer nut and NEED DSL to survive...9_9 Otherwise, it's best if you can team up with some other guy(s) and share a DSL connection and the flatrate costs.
Gee, that was off topic!
So back to topic: We now know that PB 2.6mm doesn't work with every illegal CS 1.6 version. A sensational discovery? I don't think so - but it might still be worth an explicit statement in the documentation-to-come...