Indispensable when you have large hands.

The OM D small is this is one of its greatest strengths, however we soon when you have big hands, to be embarrassed, that's why the grip, for me, remains permanently on the case.
But if the argument of the clutter is essential, just put the top HDL-6G, with its small footprint that improves grip with a second ergonomic trigger.
The lower HDL-6P is great for vertical framing, personally I can not remove it. In this case it was the addition of a 2nd battery, the trouble is that to load the first, that of the case, one must remove, the only fault I found with this grip.
To be honest, this grip, further wonderfully constructed (all metal), transforms OM D, try it to make essential ergonomics becomes so great with 3 new dials, its 2 triggers and more 2 customizing buttons, for my part it became impossible for me to separate myself, about the size and weight, it is still far from an APS C DSLR with a grip ...