I love my Hayes. I have a set of the old purple Hayes and a set of Mags. (basically the same) I haven't bled them in 2 seasons and they are still really powerful. Mine also do not squeal or make noise. But it took a little while to get mine set up just the way I like.
Mine are set up like light switches though. If you pull the lever, they stop the bike dead in its tracks. When you're really flying though, this high power has more modulation simply because of how fast you're going. I'm used to riding like this (even way back in the day when I bmx'd) so I know how to control it.
My wife's Nomad has Juicy 5's, and I like them too, but they're not dramatically different in any way.
I haven't tried any new Hayes, so maybe they suck now, I don't know.