How is it different from the Barista Express?

The Impress adds the assisted tamping lever and dose feedback on top of the same grinder-and-brewer layout. The older Barista Express relies on a manual tamper.

Can it steam milk and brew at the same time?

No. It is a single-boiler machine, so you brew, then wait for the boiler to reach steam temperature. A dual boiler or heat exchanger machine is faster for back-to-back milk drinks.

Does it come with a portafilter and tamper?

It ships with a 54mm portafilter and the built-in Impress tamp, so a separate tamper is not required. Baskets for single and double shots are included.

Is the grinder good enough for espresso only?

Yes, it is designed for espresso and has enough range for dialing in. It is not intended for coarse filter or French press grinding.

How often does it need cleaning?

Empty and brush the grinder regularly, and backflush the group head with cleaning tablets as Breville instructs. The puck mechanism also collects grounds that need clearing.