Why's that?
We have used Cressi's equipment in our diver training equipment stock and they are the least reliable. The regulators need adjust and servicing much more frequently than the other brands we have in addition to their lower performance than the rest. Our students always reach for the SP equipment first before the rest of the brands. The BC's have same issues in addition to their being uncomfortable (we get complaints from our students about the fit and comfort of the BC's). Their computer, the "Leonardo," was the only computer that needed to be sent back to mfg. for replacement. The computer is also difficult to figure out and use by the students, it has only one button as well as its algorithm seems to be overly conservative even when compared with the Suunto computers we have in our school (we have Cobra, Stingers, D9, Vyper, Mosquito).
In contrast, we have equipment from SP (BC's, regulators), Atomic (regulators), AL, Mares and they are more reliable and better performing than Cressi's. We do have issues with Mare's regulators more frequently than the others but not as bad as Cressi's. We will be replacing Cressi and Mares as we can afford it by mainly SP and also Atomic. We have standardized on SP BC's already and have phased out practically all of the Cressi's BC's (we have only one left).
This doesn't say anything about their free diving and spearfishing line, I am only referring to the scuba part here.