Yes it is more stable the only thing if your worried is that there are no activation keys for it at the moment. Otherwise I have had few problems with it. It includes the new aero peek feature and the show desktop feature as well as a couple other added features.
Build 6956 leaked on the internet late friday. It includes the new boot screen, aero peek and the show desktop feature. learn more info by going to Download Windows 7 Pre-Beta Build 6956 Setup Installation DVD ISO Image (Torrent) Ã‚Â» My Digital Life
yea, 6956 is pretty better then 6801
the "show desktop" button works, the "aero peak" works w/o any mods of anykind
the added backgrounds are awesome! they are simply spectacular
the worst possible part is that there arnt any keys out yet...=[ but the "rearm" works (so far)