Has anyone tried the Boxwave ElectraSpan Extended Battery?

[Guest ghackett]

I just got my vox last week, but after installing GoodLink, the phone got slow and almost unusable. Then I discovered overclocking and I feel much better about the device. But now the battery is more of an issue. So I ask, has anyone tried out the Boxwave ElectraSpan Extended Battery? Does it really provide double the usage time? How much fatter does it make the device? And (this ones important) since your fingers are around the bottom of the device when you typing, does it make the keyboard uncomfortable to use at all?

Any recommendations would be appreciated.

Thanks