I've owned or used most of the better masks out there including masks such as i4, grillz, profit, proflex and the i4 is a great mask, but is indeed very small. Personally for me it fitted fine but it is very common for peoples entire jaws to stick out the bottom of the mask, especially when talking. Its also quite narrow so despite being a very popular mask, a lot of people don't actually fit it very well.
Personally for me my favourite mask nowadays is the vforce grillz. I've been using mine for quite a while and they have the best features you expect like quick change and thermal lenses, soft/flexible, decent venting. they are quite durable and offer protection in all the right places, which fully protects your jaw and ears, and especially that really sensitive part just under your ear unlike a lot of masks out there. Plus i think when you factor in the lower cost plus visor and chin strap options (if that's what you like) and not to mention they are the most badass looking mask by far, i think it makes them a winner!