The slippy thing worries me as well. I'm taking it to Cornwall in September where I will be using it as a camera. Out and about using it all the time, I can see it hitting the floor without a better grip on it.
Mine gets pretty warm as well. Is that normal?
For what it's worth, I can recommend the following Nillkin case:
http://www.ebay.co.uk/itm/Nillkin-F...t=LH_DefaultDomain_3&var=&hash=item5673988521
Nice textured back, very, very slim, and it looks fantastic. Only £5.50 delivered too.