Even though I have no experience with a Zen product, I have heard folks initially complain about how light the draw is, but most seem to come to love it. I've felt the same way about my rba's. When I first got the Chalice I opened it up a little after after having it stock for just two days. A couple of weeks later I opened it up even more. When I got the ERA's they felt almost unbearable tight to me. I've since opened them up to about the same size as on the Chalice (I used a file so I can't give accurate hole sizes) and I feel flavor and vapor production are just spectacular.