Hi Joe
I used the Z2200 and Z5500 at gigs, including fairly large venues, with great results.If you do a search on the Arranger forum, you will see many favorable threads by pro players.

The only reason I am not using mine is that I went beserk and bought the Bose PAS. It is superior,IMHO, to anything out there but it ain't cheap.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact