This clip-in case is easy to attach to the Tab, and relatively easy to get off. I chuck my Tab in my handbag, and the hard plastic protects it reasonably well from any debris at the bottom of the bag, so it does do its main job. It stays closed well, as the flap wraps around the case, and is kept in place by magnets. The case looks smart, and doesn't add too much bulk to the Tab. The big benefit also is that it exposes all of the black "bezel" around the tablet, so it looks really nice with all of the surfaces free and is pleasant to hold.
You can have the case in three positions. Firstly typing position, secondly a viewing position and thirdly a reading position where the small flap acts as a convenient holding support for one's hand. As the inside of the case are rubbery the viewing and typing positions stay well in place, even in movement (e.g. in an aeroplane or train). It is easy to put the case in all the positions, but a minor improvement would be to add magnets to the groove (where you attach the flap for various positions) to make it a tad bit easier.
My gripes about the case: There is a hole for the back camera, and the case doesn't protect the camera when the case is closed and the Tab is in a bag for example. Also, if taking a picture with the back camera, you have to hold the lid of the case up, as otherwise it will block the camera (as naturally you would hold the case in a reading position doing this). You can't change the position of the Tab in the case, so there is no way around this. Personally, I would have designed the case so the Tab goes in the other way around, so you could just let the lid fall naturally when taking pictures, and then the camera would be protected behind the flap when the case is closed. Then obviously you would have some other troubles, with exposing the on/off-button and volume buttons (as the case is open on the sides), so something to think about for the designers I suppose!
All in all, great case, I think the best there is for Samsung Galaxy Tab 10.1, but there are a few little niggles that should be looked at. The case works great in practice, but leaves a few open spots (the sides and back camera) exposed.