Stick with your whirly-blade and save your cash for another burr-grinder. Any other burr-grinder.
Positive Product Points
Better than a hammer, but not by much. The Morphy-Richards clone of this one is black, so good if you like that early 90's look in your kitchen. (Edit: I see the picture has been updated to show a black model, so disregard comments about colour. )
Negative Product Points
Inconsistent grind, too much static, difficult to clean, too messy, produces too much powder, flimsy build and impossible to disassemble fully.
I have the Morphy-Richards clone of this this grinder which is identical in all respects save for the colour. A flimsy plastic body and collection box which tends to crack very easily. The electric inside also are "always on", so unless you unplug it after each use, any beans in the hopper get gently warmed by dissipating heat, evaporating all your precious flavour components. The plastic collection box also attracts static like nobodies business, which, combined with the amount of powder the grinder produces, is a seriously messy problem. The internals of the grinder are impossible to fully disassemble without taking a Dremel to the casing. This means that the stale grounds which collect inside the grinder and cannot be easily removed. The grind consistency is very poor indeed, ranging from large chunks of bean with a lot of powder, down to small chunks of bean with even more powder. It leaves a large amount of "sludge" in the bottom of a cup of French Press, and is not suitable at all for espresso. I have had passable results when grinding for drip-ground, but the difference between the quality of that and coffee produced from a whirly-blade is barely noticeable. Fortunately, I didn't pay too much for this.
Bought from John Lewis dept. store. Cheap price as it was the last one on the shelf and unboxed with no instructions.