As Olympus original accessories handle the course fits perfectly and instantly creates a better handling feel for the camera. The longer battery life is a nice addition (I'm also with the normal lifetime of a battery have been more than satisfied, but more is of course always good). The installation is lack description of how the battery compartment lid is removed, first not easy. But with a little courage (simply pull off) then folds without damage. Very practical is the holder for the dismounted valve under control that would otherwise experience shows disappear somewhere.
Mounted with the battery grip the camera has become a completely different. It fits perfectly in the hand (I have average sized hands) and can be very good and the weight just with larger lenses. The second release button (against accidental operation by a slider locking) is a good supplement that facilitates operation in portrait shots.
All in all for the E-620 is a strong buy recommendation and 5 star.