Not to argue with Nexxus, who's allowed his opinion, but for clarity.
On the "Wee" Strom 650 ABS adds 10 lbs, exactly the same weight as a center stand.
The Wee has an ABS disable switch for off road.
I would assume the Versys will have the same.
Lastly, the benefit of ABS (bike or car) is not stopping distance, it's the ability to control the machine. From AAA:
"ABS can actually lengthen stopping distances on some surfaces, such as loose snow, dirt, or gravel, because of effects that occur during locked-wheel skidding that are unique to those surfaces.
The importance of ABS to you as a driver is that it helps you to retain control of your vehicle during a maximal braking effort. Without ABS, if you brake hard enough to lock your wheels, you will not be able to steer the vehicle, and the vehicle may skid sideways or spin around"
Just watch these video's:
However, I believe you should ride with what gives you the most confidence.
I personally can only speak for ABS on my R1200RT and it's 1000% more controllable in a panic stop.
I have had instances when I went into an all out panic slide on Non-ABS bikes and it is very difficult (if not impossible) to control. I have done it, but I would trust the ABS before I'd trust my ability to control it 100% of the time.
Choose for yourself.