Ok, I received my Case Mate gelli and Barely there cases today. First impressions are that they are very good.
I ordered the Chrome version of the Barely There case and the colour is in-between chrome and black nickel, which I like.
Barely There case:
PROS:
1. Nice colour, better than pure Silver Chrome
2. Fits very well, looks part of the phone
3. Easy to fit
4. It seems to have a very good anti scratch coating and feels quite tough considering how thin it is.
CONS:
1. Finger prints may be a problem, but a quick wipe on your shirt and there gone

2. Not easy to remove, until you get the nack
Gelli case:
PROS:
1. Nice colour and the circles don't look too bad although slightly girly, the Red one helps take the girlyness away slightly.
2. Easy to put on and remove.
3. Feels nice and more like a jelly than hard rubber, unlike the ebay ones I have.
CONS:
1. My case has a slight imperfection on the one edge where a tiny piece of Black plastic has got into the red plastic which cannot be removed. Although I'm not the fussiest so I'll live with it and I doubt the perfection will be on all cases.
2. The cutaway for the charging hole at the bottom is not quite big enough and does not allow the original HTC cable to plug in properly. It does plug in but its not a very good fit, I will probably cut some plastic away from the USB connector as I will probably ruin the case trying to adjust that instead! I may email Casemate about this as its a fairly major problem.