Powermat vs. MyGrid

I'm very interested in getting one of the following;

power! Dual 1850 Rechargeable Backup Battery
Power! Dual 1850 Cell Phone Rechargable Battery Backup (PMR-PPC3) | Powermat

OR

Duracell | MyGrid
Duracell | myGrid Charging Pad | Battery Charging Pad For Mobile Devices

but am trying to get a comparison before I go out and buy one or both.

If anyone could help me out by giving me their opinion of the products from experience I would be very grateful.

Thanks in advanced

really looking for some help please

Personally i would go with the Powermat. They originated the item and duracell just copied it. If you are looking at price then go with the MyGrid. IMHO.