I own a Bianca in Denim too. It is my favorite of the Botkier bags. The leather is soft and it is lined in suede - which is rare for bags in this price range.
The leather is very soft and it is a slouchy bag with the shape of a more strutured bag. The leather is awesome! It is so soft. Compared to other Botkier bags it is very light. I think it is 2-3 lbs but doesn't feel too heavy or bulky.
The zippers stuck a little when I first got it but they are now very smooth and feel substancial.
I own the medium and I think it's the perfect size - not too big and not too small for everyday. The large one was huge for me (I'm 5'4") and really overwhelmed me. You can also stuff them pretty full without them looking too bulky. I can get a large wallet, full-size bottle of vitamins, I Pod, Full-sized headpones (not earbuds), sweater, lipstick, cellphone, chapstick, gum, keys, cardigan, and several other small items in my medium so I wouldn't call it a small bag but it is not too much for a smaller frame either.
Hope you enjoy it!
I generally don't buy duplicate bags but I'm considering another one in bone.