Man, the internet is something else. After his time racing, he went into coaching. I watched his athletes take a world championship gold medal, beating the Norwegians in Oslo.
His 10 year old, if he ever wants to "gain fitness", will not need advice from this forum.
You should have seen the ear to ear grins they both came back with!
If you are a retailer that has vested interest in selling people the latest and greatest thing because it's good for business, sure you love them. Just like our local shops here who sell them and tell customers they can ride them anyplace, though actual laws say different. Human powered bike technology is nearing it's peak, how many drivetrain, axle and head tube specs can you change and really notice a huge leap in performance? I do know how fun they are, years ago I tried a hybrid one with crappy nicad technology at Interbike and just flew past a guy on a Cervelo TT bike with aero helmet and skinsuit. I was doing 35 MPH and pushing pedals like I should be going 15.
Those of us who have spent hundreds of hours volunteering, working with land managers, legislators, and government agencies know what it took just to get shared access to hiking trails and develop more trails. To this day we still fight with crusty old hikers about access to remote trails that would be swallowed up if not for our efforts. This is simply fuel to a fire that won't die along with adding more wear and tear to some of our already distressed, overused systems. If it was a simply 50-100 watt boost, no big deal. But it's a lot more than that in stock form, and who knows the limit once mods become common place.
And call me a hypocrite all you want, but I know that skiing isn't a green activity, but I can help offset my impact by bike commuting part time and making decisions that reduce my consumption. I can afford to drive my truck every day, but I only use it for towing or when I need the capacity so I keep driving a 14 year old econobox. People who enjoy winter should be concerned about the potential for millions of more devices plugged into the power grid if they don't somehow offset what we already use. Turning a non-motorized activity into a motorized one is just another nail in the coffin of stable winters.