I learned along time ago that just because it was written on the internet didn't make it true. I've seen lots of stories, but very few people who actually have specifics/share other than anonymously.
The only thing I have heard is they tend to back door on the truck side. Their rates are low when they are posting loads. We have brokered them freight over the years but nohting we have to worry about but i am told they will call your customers. I have not had it happen though.