This case I bought for my B +. It's very handy and protects at the same time. Also included are four Fußnoppen so the whole less slips. He seems, however, very fragile, so only 4 stars. What I find gnaz well, that there really is a recess in the shell for each connectable part. Thus you can connect everything despite Case (eg camera, jumpers, etc.).
Highly recommended :)
PS: For what are the two small screws to me, however, is not entirely clear