Honestly, I'm baffled by the quality of this product at a given price point. It has a metal housing, can be powered by a 9V battery or a power supply and it has a fair amount of configurability, what else one could want from such pedal..
On the sound side it sounds pretty much identical to the Proco Rat 2 in the default configuration. I don't have any fat rats nearby to test so I cannot compare how this feels, but the original one is definitely more than close to this. All in all I would definitely buy that pedal again and recommend it to a friend.