I have run Paul touring canits F+R on my BG BLT for many years. The original circa 1997 LX cantis howled. The Pauls worked much better, but I did originally have some trouble that was rectified by Paul shipping a specially toleranced part. I have used these extensively on loaded tours starting before the photos on http://tsteven4.qwestoffice.net/
and I used them today. I have been satisfied with their performance.
However, I have shimano BR-R550s on my BG R&R EX. These are the best brakes I have ever had and perform superior to the Pauls on the BLT, they have amazing stopping power. Perhaps it is something to do with the setup or differences between the bikes, but the 550s are excellent. But they are no longer made although you can find some on ebay.
The one issue with the 550s is that it is very difficult to pop the straddle cable which is a nice thing to do to get the tire out for repair. The Pauls error in the other way, it is easy to misalign the straddle cable where you pop it in. It never caused me a problem but I never tested it under extreme braking. I have found them to be misaligned at least once. This is an operator (or mechanic) error, but there is something to be said for not risking this potential failure mode.