The problem that I've run into lately is that I jack up the car by the lifting points (usually pinch welds), and then i am left with no place to place a jack stands. Or if there is a place to put it, its not ideal.
The Unijack seems like a cool idea though.
I like the idea of having two integrated, but I vaguely recall seeing reports of them prone to leakage and the speculation was that the design causes excessive side-loading.
If your unibody vehicle is tight on space, how about placing the jack (or stands if using two to lift whole front end) under the engine subframe?