I have found it to actually be really quite sturdy, even on very slippery desk surfaces.
The stand itself is a quite ridged, yet has some flexability in that it wont snap under pressure.
The part of it that makes contatact with the desk or whatever is coated in a very grippy rubberized material that grips anything really sturdily.
It does not slipthats for sure.
So yea you can absolutely pinch and zoom while in laptop style angles on a desk, or leather couch.
The whole case is really thin and nicely designed, I also have the Vipertek slim leather case, and this is only very slightly thicker.
It does add quite a bit of weight to it, but its not to bad, and feels very solid.
The keyboard works pretty well, there is some quirks that I assume are related to androids implimentation of BT keyoards and hope to see addresed in ICS, but all in all I find it works pretty well.
When I bought it I was only really planning on using it when I knew I would need it for some reason, and still primarily have my tab in the Vipertek most of the time, but since I put my tab in, it has stayed in, and I don't think I will go back to my old case.