It's a classic, so they always have it. It only comes in black, although I think you can get in in satin as well as lambskin. The lambskin is very thin, makes it more elegant and less 'day' but also more fragile.
I wear it casually sometimes, but not everyday. Others are right, it is pretty fragile i bought the lambskin and have seen signs of scratching on it already. Also you cant fit much in there, my wallets are pretty long or big so Im on the search for a coin purse just so i can store money/cards when wearing this bag. It also fits my small digi cam along with some lipstick and eyeliner : )
I think the Caimila only comes in one size but don't quote me on that!
Regardless of the size Im still in love with this bag!