So Dimitris am i to understand that in your experience Falco does not distort the vision under the water in any way ? if that is the case i'll give it a try a few more times before i go and buy (a not very cheap i might add) Micromask.
I hear you and I think you'll probably be happy with the falco as it sounds like a pretty good mask but if at all possible for you, I would advice to choose the right mask rather than trying the falco first because it's cheaper.
Only saying this because many times where I made a decision based on price and went for the cheaper option, in the end I ended up buying the more expensive one too a few months after.
Also, and this might not apply to falco. since you mentioned the sphera: it is an excellent mask but you need to factor in to the cost that you will have to replace it more often than say the micromask. Mainly because the lenses do scratch but for my old sphera, I also had to replace the strap (after about a year and a half of using it once a week)