My BIL/SIL used it and were happy. I looked into it, but we just have too much stuff (IIRC, it was cheaper to rent a Ryder truck for the amount we had, plus we got a dolly for pulling one of our vehicles). I think if you've got less stuff, don't want to drive the truck yourself, and you want to be in control of the packing/unpacking, that it would make sense.
Remember that an ABF trailer is high, both the floor and the ceiling. As the professional movers say, one good way to minimize damage (and save money on the rental) is to "pack it tight". Sometimes it takes some creativity to find a way to use the upper space. Light boxes with less breakable stuff (lamp shades, etc) work well. If you use standard-size boxes (such as used by movers) it will be easier to use the space efficiently. You may be able to get these free from folks who recently moved.