MaryMary-I ended up buying the same case at Best Buy but mine's by Rocketfish. It looks identical to the Riot Outfitter one, but $1 cheaper The front is gray leather with yellow stitching so it doesn't look fabulous with my pink G4. But I feel better having some protection on my receiver.
I think that the ideal case would have a leather front like the case that came from Dexcom. But then the back should be a slip in neoprene like the Riot outfitters/Rocketfish cases. Black would be good or even better they could come in various colors to match the G4 colors.
I have one more case coming from Amazon that might work, but so far everything else i've tried has been a dud. I'm waiting to get up the courage to cut apart the leather case from Dexcom, but I don't think it will look great with one side completely cut off.
As Mary mentioned in her post, this case is an armband case so you have to cut off the straps. Super easy to do and looks OK once you do it.