2 Reverbs and 2 Delays is not very luxurious, I agree. But it's a PreSonus tradition (...) and you should consider that with the Series III they have introduced the "modelling" of effects and processing units, so there is an remarkable evolution. Actually there are two aspects important for evaluation: 1) The integration of Studio One in the workflow and 2) the "add-on" of an AVB Waves Rack as shown at this years Winter NAMM. All this will add a lot of processing to the Series III mixers, so time will tell what "professional" is, or not.