You guys have read all the reviews and such so not much info I can share.
Pic of me wearing it. It actually fits my small Asian head very nicely.
The I4's are very easy to take apart also. Only 4 main pieces; Mask, lens, strap, and soft ears.
Lens is easy to take out, you just push in the tabs and pull the lens out, no need to take the strap out. And to take out the strap you just need to tug them out at an angle. and you take off the soft ears you just unscrew them from the strap clips.
I3 Pros has a few more pieces and is a bit tougher to take apart. It has; Mask, frame, Lens, strap, and soft ears. To take out the lens you need to get each individual clip out of the frame with a squeeze and pull type of style (how I do it), you need to disconnect the frame from the mask, plus you need to take the screws out of the soft ears connecting to the mask.
I love both of these masks and I'll continue to wear both.