We just moved into a house with a large kitchen with tiled worktops and a breakfast bar. Crumbs are a nightmare descending in cracks. Simply wiping with a damp cloth is no longer an option. I did not even suspect that such devices existed, and without quality reviews it is difficult to judge. The suction power is not like ShopVac, but with 3 volts it does its job. I believe that if there are a lot of crumbs, it is better to pour them between you and go to the kitchen in two passes. The brushes on the bottom need some maintenance (soapy water/comb) especially when our kids are using them and snagging jam, gravy or something sticky on the countertop. You can see it in action, see the assembly and hear the sound. We'll probably order a second one to make sure we have a long-term solution and a backup, that's good and quick.
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