I'd never snowshoed before, but I demoed a pair of the Atlas E10 Series snowshoes while I was on vacation in Colorado. The shoes fit pretty well over my boots and were relatively comfortable, though I have nothing to compare them to.
I have two complaints, though, but they're not too bad. First, these tend to kick up a lot of snow in the back, leaving your butt and the backs of your legs pretty chilly. Luckily, it was a warm day, but it was pretty annoying. Second, I found that after a while there was a ton of snow stuck between the bottom of my boot and the footbed of the snowshoe. I'm fairly certain I had it on correctly and was strapped in tightly. The extra weight of the snow and the slippery surface of it really made walking difficult.