I have had terrible trouble finding a mask that did not leak. I had one generic cheapo that worked but I guess was somehwat poor quality because after 30 (summer) dives the silicon kinda hardened, and didn't seal anymore. I did not want to buy another of the same since I need Rx, and it gets costly to keep two and renew after every 30 dives!
I tried Cressi Big Eyes, Mares X-vision and several others than can be fitted with drop-in Rx lenses. No luck. Was getting quite discouraged with constant nasal flushings. New season started and got my hands on one of the first Rx'ed Atomic Subframes - thanks to PGDive, delivered straight to dive site! It fit absolutely great on land, so off I went. I was particularly hopefull since the silicon under the nose cuts nice and close to the nose, and oh boy is it supple. The lenses are really ultra-clear (tho I have to say the Rx's could have been cut to look a bit, umm, appealing).
First few dives it leaked. I was discouraged. I had a chance to return (thanks again to PGDive's excellent crew) but I continued to experiment because it felt like it was sealing. I had had it way too loose. For some reason it feels so very different and snugs up to my face that it took me like 6 dives before I understood to tighten it properly. With my face I still get little spills when I move drastically but it really sits nice with that soft silicon (mine is black skirt btw). Also, I like the buckles better than any of my previous ones.