Well, to be completely honest I didn't have the opportunity to walk around with the Aeon Flow, its an assumption reached due to the bulk and weight of the Aeon. Its not that they're heavy per se but their size and clamping force would restrict them to basic walking I would think. Someone with a more practical and opposing view is welcome to chime in. As far as prices on ebay I would assume that due to their being discontinued the PM-3 are now approaching the retail price of the Aeon and not the orher way around. I think its a bit artificial and with a little looking around one should still be able to secure a pair of PM-3's for actual retail.