I have to be really honest here. I have, however, practiced techniques with our local police department. We do some of their training and they let us observe and ride with them when they do the fun stuff. The ABS bikes were doing pretty well, but we were consistently out braking them on our personal non-ABS bikes. I think they are one of the biggest advancements in motorcycling in the last 10 years, but in the same breath, though, they are not meant to replace rider skill.
ABS is designed to sense traction problems and react faster than a rider can.
Sure, we were outbraking ABS bikes in a controlled environment, but had there been a patch of oil on our braking path, we non-ABSers might have been toast. ABS is a wonderful invention that has and will save many lives. As with most other things, it is great at what it is designed for but don't count on it to fill in the gaps where your skill level sags. It should compliment your skills, not replace them. I've ridden ABS-equipped bikes and found that I can stop faster with the ABS disabled.