Overpriced and over rated. For 150.00-200.00 on the right platform, they would be really decent. Short of that, there are way better choices availible.
I tried mine on a few shotguns and carbines. Its too low for use on an AR with a standard FSB and there isn't a riser that I know of. For a small RDS, its decent, but much better choices exist.
The Aimpoint Micro is probably one of the best RDS' availible, large or small. Aimpoints, and EoTechs are combat proven-there durability is proven. This isn't the case with the Z-Point.
I don't recall what the battery life was, but it was better than my EoTech 5.11's*clearly* but worse than my Aimpoints*clearly*. I don't see how the solar BS is any better than the fiber optic/tritium of other optics.
On a DSA TP9 or HK MP7, the Z point would be a decent choice. Even then, an Aimpoint micro is still better. I would rather have an Aimpoint/EoTech/Trijicon reflex over the Zpoint.
YMMV