I don't know exactly how different the feather is from the disposable "straight razors" that use half of a DE blade (I think they're called "shavettes"?), but I gave one of them a try after I had been using the regular straight razor for a little while. I didn't like it at all.
The blade was ridiculously sharp, of course, and not at all forgiving. That's one of the great things about the straight razor: you can basicaly customize its sharpness to your liking. After a while it's as though it becomes... a part of you.