We actually booked Espresso along with Klezmer Fusion Band (when merged, they call themselves Klezpresso). The band had great song selection and varied music throughout the night (mainly jazz standards, classic rock, Motown and some Jewish music). The band had great sound and kept people dancing all night long!
Great song selection, willing to learn songs for us, had great sound, pleasant members, great instrument selection. Was sometimes hard to contact due to other engagements.