Just bought the E-PL5 for it's superior high ISO images (less or no noise) and find the camera doesn't fit my hands very well. The supplied screw in grip is very shallow and doesn't give you a secure feel.
I wish I knew why sometimes I can activate the shutter on the S3 with my voice and other times it doesn't respond at all. Voice control would have been helpful with this one-handed shot!
The Olympus MCG-2 E-P3 was originally designed for Olympus' E-P3 but fits the E-PL5 just fine and with it's more rubbery feel than the one that came with the camera, really gives one a good hold.