I've never used one, but I've heard good things about them. I will say I really like your idea. I think taking care of this older stuff and keeping it running is not a bad way to go for some people.
I agree, I've had a for-most for a year now and I like it a lot better than the priefert I had before, both are fine chutes, but I wouldn't want to go back to a priefert now.