The Barista Express was my first machine... I liked it at first, but the ease of use rapidly goes down after guests arrive. Its limit was around 3 cups/15 mins sustained I believe as the vibe pump & grouphead needs time to chill.
I recommend buying a spare for the grouphead gasket as mine broke in 6 months... It's a good machine for home use but dont expect it to come close to proper cafe quality without a separate grinder. (The B DualBoiler can match cafe quality with a standalone grinder. The reliability is not as good however)
For secret tips :
The breville's temps are low so flush the group for around half a second to warm up & even out the exposed metal's temps.
Program it to go as hot as possible, it likes to chill.
Grind it slightly finer than usual, then hold the shot button...this will use the pre-infusion setting for a longer time. Play around with it to find the sweet spot.
Try not to stop by time. Stop by volume instead regardless of time (in preinfusion)
Try to Single Dose. Dont leave beans in the hopper as the hopper itself gets quite warm when the machine is on.
Try to hit 9 bars (around 12:00-1:00 in the dial) with the pre-infusion setting and pull a 1:1 ristretto (hahahaha
Magician of the Great Coffee Bean Pressure-Extraction Machine.