The ABS works very well, but there are a few negatives to consider.
1) its heavy
2) its expensive
3) it draws lots of current, so requires a bigger battery, i.e. yet more weight
4) the control unit is not as tough as it might be - not as tough as the Motronic. Mine died in a low speed tumble and was very expensive to replace
5) it cuts in quite early. If you practice your emergency braking a lot, in the wet as well as the dry, you can brake later without it. But in my experience you're unlikely to get to this skill level unless you put in some time at the race track - and keep at it in the rain.
6) it is easily confused by hard braking over a series of bumps. E.g. when pulling up at a T junction on a road surface whose top layer has worn away. In these circumstances it can release the brakes, leaving you sailing across the junction out of control (happened to me twice - luckily no cars hit me.)
7) if it packs up you tend to panic in an emergency because you've become reliant on it and your braking technique is rusty. (Happened to me once - BIG accident followed.
8) it makes the whole brake system spongey, requiring more lever pressure from you and reducing feedback.
Having said all that, there's still a good chance it will save your life, probably on a wet road, especially if you are one of the majority who doesn't practice emergency braking and tends to freeze up at the vital moment. So get it, but be aware of its limitations.
P.S. I've used ABS 1 and 2, but not the latest Evo brakes - maybe some of my comments are out of date? I'd be interested to hear from anyone who knows.
If a thing is worth doing, it\'s worth doing to extremes.