I bought this as an impulse buy in the Black Friday sale as my son had been nagging me to make home made crisps. What you get is a plastic trivet which is about the size of a large dinner plate, and which "justs" fits on to the microwave turntable, together with a mandolin for slicing the potatoes (or whatever other veg you are making crisps from). The mandolin will probably prove useful anyway for other jobs, apart from crisp making.
We sliced the potato onto kitchen roll and patted it to remove the starch. It does slice nice and fine, as stated on the box. We then put the slices onto the trivet and into the microwave.
Instructions say to nuke for 3 minutes - that wasn't really enough, we ended up with about 4 minutes, but I expect each microwave is different.
Result: We put the cooked crisps into a plastic bag and sprinkled salt into it and shook it up to try and season them and give them some taste, but the overall result was a bit of a disappointment, pretty tasteless really, although we will try again with some more spicy seasonings. To be honest, you can't really beat a bag of proper crisps, although they don't take long to make, and we will use it again because, if we don't, it will just mean that we made a very expensive portion of crisps.