How deep will it cut?

With a 4-inch blade the maximum depth is shallow, roughly an inch and a half at 90 degrees. It is made for trim, sheet goods and small stock, not 2x framing lumber.

Does it come with a battery?

It is sold as a bare tool. It runs on Kobalt 24-Volt Max batteries, which you need separately if you do not already own them.

Can it really cut tile and brick?

The saw is marketed as a multi-material cutter for wood, metal, brick and ceramic tile. Each material needs the correct blade type, and masonry and tile cutting is slow work on a 4-inch saw.

Does the dust port fit a shop vacuum?

The dust collection outlet is designed to connect to a vacuum cleaner hose to keep the work surface clear. Check the hose diameter against the port before relying on it.

How does it compare with a full-size circular saw?

It is smaller, lighter and easier to control one-handed, but it cuts far less deep. Use it for trim and small cuts and keep a 7-1/4-inch saw for framing and thick stock.