Caissa App for iphone

Have any of you tried the new Caissa Chess app for the iphone? There's also another new app available, Versus Chess, which allows one to play live opponents via Wi-Fi. Any thoughts? Thanks.

I bought Caissa. It's quite good. The interface is very nice and polished - though could use a few more features. Reviewing a game etc. 2 player is a little awkward as it moves the pieces away from your finger as you push them, but it assumes you're at the bottom of the screen pushing up for both players.

All in all I'm happy I bought it.