Remote shutter for Olympus OM-D

I'm in the market for a remote shutter for my OM-D, and I looked around and saw that the RM-UC1 was compatible with it, on the official Olympus store. When I went to Amazon to see if there was a lower price I saw that there were many options with the same name. My question is, are they all compatible with the OM-D, and is there one in particular you'd recommend?