The ABS works very well and I think most that have given it a chance on loose descents have been surprised by how unintrusive and usable it was. On wet asphalt it is flawless. It maybe the best implementation of ABS I have ever experienced on any vehicle. Its sensitivity and response has always been expected rather than unexpected.
I actually don't recall much in the way of complaints about how it works at all. I think the complaints that have been aired have related to it being more complex to disable than it needed to be for those that want to disable it for loose surface riding, rather than anything wrong with the ABS itself.