I had an iGo. Still have it in a drawer somewhere. Takes forever to charge a device, doesn't charge fully, the fixed end is awkward to have plugged into a device, and it won't take rechargeable batteries.
I had high hopes, but all in all it was not much better than the junk Duracell version I used to carry.
It may work for you.. maybe they improved it (mine is at least 4 years old)..
I suggest spending more and getting something from Anker. My Anker is the cylinder shaped model and it works very well.
Yes, I do like the idea of using standard AA batteries so that I have spares for my lights, but not if they don't take Eneloops and not if they don't work well.
The Anker has saved me many times, is easy to use, has a small form factor, and has a corded jack.