If you do a decent amount of walleye, pike, or even LMB fishing through the ice and are looking to add to the arsenal, I’d give them a look. If you already have a nice stack of quality tip-ups rigged for different species, they may be an unnecessary gadget. It all comes down to what you may already have for gear and how you prefer to fish.
I personally do not own any nor care to, but two of my regular ice fishing partners always set one. For me it is simple seeing as I already own tip-ups (pike, LMB, walleye) and tip-downs (perch and crappies) to cover everything I need. I’m not going to buy a product/tool just for the sake of replacing something I already have that works just as well.