I hired Moving Right Along to move a couple of large, expensive pieces of furniture that I didn't want to risk moving myself. It cost $700 or so and I even paid for their extra insurance because I thought it would be worth it to be extra careful with these pieces.
When they were moving, though, I saw them rushing over uneven surfaces, putting things down roughly, and just not taking proper care of the items. They also took hours longer than they should have to get from one place to another, and charged for every minute of that time. They ended up damaging a beautiful lacquer TV table, and responded by sending out a repairman who only made things worse and completely ruined the finish.
About two months later, this is still unresolved, and they won't honor their insurance policy. Stay far, far away from them.
TL;DR, they cost a ton, charge for everything, and ruin your stuff
more