At the moment, this is the mask that leaks least w/ me (usually no beard). I have lots of masks......sigh....
My younger son has a Tusa purge that he loves (single lens) and has used for at least 3 years. I can't get him to change. When I was younger I used a Voit Swimmaster w/ purge for many years w/out a hint of trouble. It was single lens teardrop w/ a huge purge moulded into the nose pocket. The outer skirt was neoprene like a wetsuit and sealed extremely well. Pressing up on the purge w/ palm would cause neoprene skirt to seal against nostrils for clearing ears--worked good. As the mask aged, the neoprene shrank and curved inward so that you had to work the seal out when you put on the mask. I think the large diameter purge was much more resistant to sand etc. than the more common smaller valves. In it's day it was awesome and looked oh so cool.
My younger son has a Tusa purge that he loves (single lens) and has used for at least 3 years. I can't get him to change. When I was younger I used a Voit Swimmaster w/ purge for many years w/out a hint of trouble. It was single lens teardrop w/ a huge purge moulded into the nose pocket. The outer skirt was neoprene like a wetsuit and sealed extremely well. Pressing up on the purge w/ palm would cause neoprene skirt to seal against nostrils for clearing ears--worked good. As the mask aged, the neoprene shrank and curved inward so that you had to work the seal out when you put on the mask. I think the large diameter purge was much more resistant to sand etc. than the more common smaller valves. In it's day it was awesome and looked oh so cool.