I do not have the mask, but I have worn one to see what the fuss was about. IF you have good vision or the opposite vision of what it corrects you will need a corrective lens kit as the mask design w/o the corrective lens creates a correction for near-sightedness (I think that`s right) due to the basic design. The mask is quite nice if you can afford to spend that kind of money on a mask.
The only other downside I could see would depend on the exhaust vents for each specific user`s regulator set up. Some of the micro units may have exhaust vents too close to the mask and cause bubbles to hit the bottom of the mask rather than vent them to the sides of the face, but that is also relative to body position and movement (or lack there of).