Sounds neat - I always wondered about those gadgets. I worry they’ll cut away part of the good stuff?
If you have very good knife skills, you can get more of the edible pineapple with a good knife - the corer results in about one-eighth to one-quarter inch left inside the skin. But it’s a tedious job, and I’m not good enough with knives to do it quickly and efficiently. I like the gadget ;-)