The Nokia DT-900's have really worked best for me overall. A While back I bought a Maxell dual charging pad (one of the few dual pads out there) and while I really like the design and ability to charge 2 phones at once, it has been exceptionally fussy about connecting and tended to charge more slowly when it did. I stopped using it a few weeks ago after being able to pick up a couple more DT-900's cheap.