I find the weak point of the FMB to be the single bolt atatchment to the speaker. My qs8's have a tendency to rotate slightly if bumped giving them the crooked picture look. I have tightened the mounting bolt tighter than I felt comfortable with to limited success. I can see a vpseries or m-22 being touchy. A toothed mounting surface on the FMB or speaker or both might be a positive upgrade for future versions.