As far as snail based masks go, this one is pretty great. It's not as snail-y as the NRK snail mask but it definitely does the job well in terms of helping to calm down and heal skin that has been irritated. Personally, I have been using these after I do my weekly 15% glycolic acid mask and it has been working really well so far.

I've found that the effect is not instantaneous but is generally seen the next day in terms of calm, even skin. I have no issues with the fit of this mask but I think that mask fit is very different from person to person (I personally hate the fit on some masks that other people love).