I think in the end it always will come down to the first consideration of the job-MONEY. Plain and Simple. If i told you a job would be $500 for a tie in w/ Studor or $2500 with a wall/ceiling penetration and stack tie in. What do you think the customer is going to go for. And the fact that is may be a 6 hour job versus a 20 hour job.

Studor Vents or AAV are safe. They are just "different"