Not actual experience, but from what I've heard (10 years ago) they are a very off/on type of brake, without much modulation.
I switched to HS33s very early on as they are very powerful (will flex the frame outwards as they push onto the rim) and modulate well.
More importantly they don't squeal - which was important as I was riding bridleways in areas with lots of horses and is something that discs are prone to when wet and/or contaminated.
I think they wear the rims less as well as they are more effective in the wet as they are more powerful, so you don't have to drag them on the rims for so long.
I am just fitting some onto my Birdy folding bike.
There is some skill to setting them up properly - I used to set them up square on to the rims but with the 'calipers' loosened off a bit and then depress the brake to push themselves back into the loosened calipers a bit, and then tightened them all up.
Punctures just involved removing one side of the caliper, which was easy with the lever arrangement.
There are loads of videos on youtube about it anyway.