I have a 2010 CB1300 with ABS. Along with a few other bikes I must add. I learned to ride quite young and passed my test at 16 in the UK, that was the last year anyone was able to do this as the law changed just after so you had to be 17 to ride a motorbike. Just saying this so you can get an idea of experience. I rode everything there was at the time (1970s) ended up as a club racer or production racer as it was in those days, a Honda/Yamaha/Suzuki main dealer mechanic. Never had an accident since 1972 and I'm what you would call a "nutter" when on a bike, or so my mates would say. I ride very hard, but safely IMO.
However all that changed in Nov 2011, I was coming home from work on the 1300. Stopped at a set of lights as they were red. They changed, I set off quite smartly as I was dying for a piss, car on the opposite carriageway decided they'd like to turn right and just didn't see me. All this happened within 5 secs, I was looking left at the time as I was checking the traffic coming down the side road to make sure it stopped. I spotted the car turning across me, now I'm a VERY experienced rider, I know how to brake, however the first thing I did was grab a handful of the front brake and stomp on the rear brake, the bike was front end light as I was accelerating fairly hard so first it had to settle down on the front end before the front brake really started to grip, the road was quite damp BTW, all this took about 2 secs if that, I was probably going around 15mph as I'd only just set off. Without ABS I'd have still have hit the car but I'd have hit it harder and in a worse place, possibly I'd have been on the floor either in front of the bike if it spat me off (hate to think of the bike crushing me against the car if that had have happened) or behind the bike and going to hit my own bike when it hit the car. However thanks to the ABS I was able to control the bike to some degree, things by this time appeared to be going in slo-mo, weird that but true. I was able to steer the bike to the left, the forks were now fully compressed, the back end was starting to get light due to weight transference yet I was still able to steer away from the car. In fact IF she had spotted me and braked I would have avoided the accident, I stopped the bike with the front wheel right in front of her bonnet/hood as you yanks call em. She then hit me, real hard, luckily my leg wasn't between the car and bike as only the front fork area was hit, without ABS I'm 100% sure my leg would have been there, providing of course I'd have been able to steer the bike in the first place. End of story, one fractured pelvis, one set of bollocks you could use as space hoppers and one arm/shoulder very very bruised, bike was written off as she pushed it a further 10 yards or so with it trapped under the car, by this time I'd exited stage right over her car.
I bought an identical 1300 as a replacement, again with ABS as it's standard after 2005 on that model. Whilst working on the rear end I accidentally caught the ABS sensor and ruined it, my fault entirely. The ABS system was now not working, light on dash etc to let me know this. However I didn't alter my riding style at all, well I did for a few miles until I figured out that I could brake almost as hard without it, I rode like that for 3 weeks until I fitted a new sensor, no problems whatsoever and this was in winter again BTW.
Would I say ABS works, yep, big time, is it worth it? 100% is it costly to repair? not too bad considering. I'd buy another bike without ABS without any problems, however if there was an option to have it fitted as standard I'd go for it everytime.