I sometimes wear glasses playing (usually contacts though). I obviously have several pairs of glasses, yet only one fits under any of mask I have tried. Most are too wide (so the mask lens forces them to dig into your face) or are too far forward (again forcing them into your face). So with all but one pair of my glasses the lens pushes them into my face, making it extremely uncomfortable. They also have a tendency to scratch the inside of your lens.
These above not only seem wider than all my pairs of glasses, but stick out further too. You will find they have the same issues I encountered, possibly to a worse extent as well :/
IMO I don't see the point/application to paintball... They will be uncomfortable, damaging to your lens and risking over a thousand pounds needlessly. Why not utilise the fact you have to wear a mask in paintball anyway and buy a miniature action cam to put on your helmet?
And for anyone that is thinking here "But they add extra area on the outside of your mask to get shot." well you are right. So get a motorcycle helmet cam... They go inside the lens, much like glass, but cost a fraction of the price.
Besides, it only shoots 720p video and without any high fps feature for4 slowmo shots.
In conclusion:
Not worth the price. Buy a decent motorbike helmet cam. Half the price, twice the video quality.
But hey, that's all just my opinion