I registered for these forums for the sole purpose of reporting my miserable experience with the Zagg Sparq.
I also took advantage of the 50% off deal, and bought a Sparq. Straight from the box, it would not charge my devices, even when it was plugged directly into the wall, and after charging overnight had four out of four lights on. I sat on hold for 75 minutes waiting for a customer service rep to tell me that it must have been a DOA unit, that on rare occasions this happens, and that she would very sweetly offer to send me another one. Weeks later I finally get my replacement (to be fair, the holidays were in the middle of that period) AND THIS ONE IS DOA TOO. Now I have to sit on the phone for another hour and a half and go through the same silly dance to get yet another replacement, and I haven't even gotten the chance to send the first DOA Sparq back yet.
DO NOT BUY THE ZAGG SPARQ. Even at 50% off, this thing has been more trouble than it was worth.
EDIT: It's not actually "ZAGG Sparq", but to make the already juvenile spelling and capitalization even more annoying, I just realized that it is "ZAGGsparq", all in one word. And yes, the lights on both of my "ZAGGsparq" units are amber, not green. And yes, I was put off by this too. And no, no amount of friendly (but slow) customer service can make up for crappy products.