We have the L25500. Our signmaker comes from a shop that had the jv3. He has commented several times that he could never produce reds with the same intensity on the Mimaki that we get on the L25500. I don't have any personal experience, but he is definitely impressed. We use Onyx and Flexi 10, so I can't comment on Signlab. Their website doesn't show the L25500 as a supported printer.