Does anyone have any experience with this grip? I was told that there isn't a grip for the D50, and if this is real, what becomes of the battery compartment door when the grip is in use? I've got a message in to the retailer with no response as of yet. This would be excellent news if it works, but for some reason I can't find it for sale in dollars, meaning that it's only available in the UK for some reason... . Thanks.