I have been using the bypass and it definitely helps. My first fires were done with almost 50* outdoor temps. I expect smoke rollout to improve once temps drop. So far the stove has performed very well.The newer Austral II and III have a more serviceable design than the original. They went with the tubes and replaceable baffle.
The bypass should always be opened before opening the stove door. Open the bypass, crack the door open an inch, wait 5 seconds then open. That should stop smoke rollout in most circumstances.