After several dives with the ProEar 2000, I have found the following benefits:
It works well for keeping water out of the ears, but with the admonition that if the there is a perforation of the tympanic membrane (ear drum) or a tube in the tympanic membrane, additional care must be given to avoiding disturbing the seal of the ear muffs.
I do agree that for some reason, it seems to make it easier to equalize. I think this may have to do with the mass effect of water vs air, since the pressure remains the same with either in the ear canal and there is less mass in the external canal.
I think it would be helpful for both sport divers and saturation divers who have a problem with external otitis and for those diving in contaminated waters. The mask does have a strange appearance due to the ear cups and it does take some getting used to. I feel the benefits of the mask outweigh its unusual appearance