If anyone can be bothered to take the time to set up their cantilever brakes, they work as well as any other braking system and are cheap to maintain.
The downside is that they rely on the rims as a braking surface so any water or oil will turn into a nasty paste grinding away at your assets
When working you have good modulation, sometimes missing from the more snatchy on/off V-brake
Discs, well, they are the cure all for the cycling business but for me as a rider, they have more against them than for them.
Having ridden with discs since 1995 and the first generation of Hope hydraulics, they were fantastic. But after working with them in a bike shop their flaws became more apparent.
Seals, contamination, lubricant, contamination, worn discs, squealing, contamination, the bewildering amount of pads, contamination, the bewildering amount of standards and, finally, contamination
Yes, customers rode their rims to destruction but the same people then went on to ride their discs to the metal, seized pistons, rotted levers and so on.
I still shudder at the phrase 'my brakes squeal' whenever I hear it or them
So yes, I do find them satisfactory but only because I enjoy the pain and frustration of setting them up right. I like v-brakes too, easy and powerful and I do run discs but they give the most torrid times because they can be just so gosh darn fussy
...but then I also run rollercams, dual pivots, single pivots, u-brakes, centerpulls and drums
but not on the same bicycle