I've had Elixir Rs on my bike for two years. All I've done is change the pads. When they squeal I take it as a reminder that I should brake less!
I just don't accept squeeling brakes, its obviously avoidable because my old Shimano XT didn't do it, so I don't accept it on any brake.
My old XTs were great but fell foul of the dodgy seal issue and failed after two cold winters. 5 years in total though with only one bleed, can't complain.
Current Elixirs feel great and seem to run almost silent, seem to suffer from heat build up though and I hear bad things about them in the long run, assuming its something to do with the pistons getting dirty.
I'm trying my BB7s again, stopped using them for a while because they were horrendously noisy in the wet, but it might have been the cheap rotors I was using. I've also bought some organic pads for them to see if that makes the difference.
Tempted by the new maguras, assuming the new ones are as reliable as the old ones reputedly were.