Does it really leave a smooth edge?

Yes. It cuts along the side of the can rather than through the lid, so the lid and rim come away without a sharp lip. You still handle the lid carefully, but there is no jagged metal.

Will it open large or tall cans?

It is rated for standard cans of any size, including large soup and vegetable cans. Very tall or non-round cans may not sit well under the lever.

Can the parts go in the dishwasher?

The removable activation lever and the cutting assembly can be washed, but the motor base must stay dry. Wipe the body with a damp cloth.

How much counter space does it need?

It stands about 9.35 inches tall and 4.6 inches wide, so it needs a small dedicated spot. The 1 ft cord means that spot should be next to an outlet.

Does it need batteries?

No. It plugs into a standard 120 V outlet and draws 100 W, so it is for US household power only.

Is it better than a manual opener?

It is easier on the hands and gives a safer lid edge, but it takes counter space and depends on an outlet. A manual opener is smaller and works anywhere.