The convenience of the MFI technology on these goggles is hard to beat. It's nice to be able to switch lens or just de-fog the current lens in only a couple seconds anywhere on the hill. I have had some issues with them fogging within the middle of the lens if I leave them on my head/beanie for too long but it clears up fairly quickly. Store the lens separate from the frame and it greatly helps the issue!
MFI with the face mask is so convenient and perfect for my undecided self. I can move the mask over my mouth while riding and not have to worry about getting the correct seal with my goggles because the magnets take care of it for me.
I've already had a couple big falls, face to the hardpack and powder, nearly missing trees, and have had no problem with the lens popping out.
They're comfortable, they look great, the field of view is wide. Its worth dropping the money for these goggles. Go for it.