There are two types of faces, those that work with any mask (no leaks) and those that are sufficiently different that they don't work with most masks...
I, unfortunately, am in the latter class. Most masks will leak under pressure for me, right by the far corners of my eyes (issue of cheek bone and forehead shape and width of skull).
With my first mask, I was just plain lucky. It just happened to not leak and it fit well.
My second mask was a disaster -- I thought it fit well but at 30 feet, it would leak no matter what I did.
Long and short of it is that, for me, most masks don't fit. The best way to test is find which masks feel like they fit and then test them underwater.
This is doubly important if you need prescription lenses in your mask... At $150 bucks for bifocal lenses, a mistake in mask selection gets very expensive very fast.
In my book, if you find a mask that really fits well, go buy another one...
And I love LeisurePro and DiveInn and other internet shops but for something like this, I have to go to my (friendly, supportive, helpful) LDS cause they have a pool in which to try-before-I-buy.
[I buy other stuff from my LDS too. And I buy stuff from the Internet...that's in a different thread.]
Cheers,