Faema are good solid machines.... the only down side with the express is that it is an automatic (like my La Cimbali).... so lots of electronics adding to cost of repair/refurb if there is a problem.
Other than that, commercial machines are easy to work on, and parts are very reasonably priced... and the fact you can do the refurb yourself makes it a practical proposition. They make great espressos.
If it hasnt been used with a water softener it will almost certainly need a descale...... which Id probably do in any case.
See if you can see it running.... does the pump deliver a nice steady 9 bars? (becomes expensive if not)..... taste the water from the boiler.... if it tastes foul it has probably had milk contamination.... and that can be hard to remove totally (need to soak the boiler in Caustic soda.... and then flush really, really well).
Make sure the volumetric dosing works... if not a new computer board is hundreds of dollars....
It may look far worse under the covers than it is by the way..... generally these machines look disgusting but clean up really well!