I've had both. I've kept the Feather.
Both give excellent shaves in my view - but very different in character. I wouldn't describe the Feather AS as mild, but I wouldn't describe it as aggressive either. You get excellent feedback as to where the blade is on your face and what it's doing, and, if there is a knack to getting the angle just right, I mastered it very easily and without really noticing. (Which is to say that I don't think there really is anything about getting the angle just right - certainly no more than with any other DE razor.) My experience is that it works best with blades that are regarded as sharper than average - Feathers, Gillette Super Thins, and the like.
No, it's not cheap, but in terms of it and finish, it leaves the Futur in the weeds as far as I'm concerned. I just found that the Futur wasn't something I really enjoyed using all that much - it was OK, the quality of the shave was hard to fault, but it just didn't set my day up in the way that the Feather does. The Feather feels really special - a superlatively made item, which gives pleasure not just in how well it works, but in the tangible and visible quality of its execution - like an unobtrusive, very high quality wristwatch. If I want to shave with an adjustable, I'll reach for my Gillette Slim Adjustable from 1964.