It measures 119.5 x 171 mm (when closed) which are average dimensions, but the 16.3 mm depth adds noticeable bulk. (pocket-lint.com)
So this controller is 145 mm width x 145 mm depth x 124 mm height, it WO N'T be comfortable at all to hold. (rectifygaming.com)
Samsung also has another tablet device called the 8.9 that, as the name suggests, has an 8.9 - inch screen (not to be confused with the 8.9 mm depth of the Galaxy Tab 10.1). (pocket-lint.com)