I'm a big fan of gear but I'm a little bemused at the price one online retailer is asking for the MB-D12 battery grip for an 800E I've put on my radar. I know I know, don't buy it or go buy the fake for $300 less, all true but has anyone out there got an opinion on the genuine grip, is it really worth that much more??? It just holds a battery and allows comfy vertical shooting, right???