I've used them and have nothing but good things to say.
The resale process is slow, uncertain, and frustrating, but the brokers are one thing I don't think you really should worry about. I've seen occasional problems with unscrupulous sellers, I've seen some scary ineptitude by title agencies, and the ROFR process can be maddening.
But I wouldn't worry about the brokers. They are good and they are also one of the most tightly regulated professions here in Florida. Worry about ROFR.