Hello. My experience with this product is: First I received a defective item. So I asked this has ever held a return procedure. The seller kindly offered to send me a photo of the defective device, another replacement, without charge and without reference to the former. I thus received, he, quite functional. Well, what to say except that the product fulfills its function? There are two sizes of chips, modules are easily interchangeable and washable, and the cutting is done easily and correctly, as expected. Also satisfied with the professionalism of the seller. I would not have received any faulty item at first, I would have put 5 stars.