More cons than pros
It takes too long to charge and doesn't hold the charge. I've read a lot of negative reviews about it but bought it anyways. Shouldn't.

tech specs
Looking at the three versions of this: 10W, 20W, 100W, I found the technical details on the B+D site helpful:

The 10W has a 700mAh battery, This Model # CPI20XB (the 20W) has a 2Ah battery, and the 100W a 4Ah battery. It looks like they are progressively heavier, but I can't find accurate figures on weight or dimensions.

Input - 8.4 VDC, 5.0A
Output - 115V AC 60Hz-20W for 5 minutes, 16W continuous
Battery - 2Ah, NiMH
USB - 5V DC (350 mA)
- *Approximate talk time based on average results using commonly used cell phones. Results may vary depending on features/cell phone used.

November update - I ordered the product. One negative is that the power adapter provided to charge it is only for 120V countries (the US, basically)... I wasn't able to put it through any significant use so far, but I will try to test out how well it recharges electronics and how well the battery holds.

Excellent portability!
For a on-the-go, fit in your pocket power source this cant be beat. I dont know any portable power sources for this low price that give you an indicator bar (the kind you'd see on a cell phone display). This works great and Im glad I bought it.