I'm not sure on the RV platform but on all the aerobatic aircraft that went through my shop (and there were many) the Barry mounts performed/ lasted the best by far. On the MX-2 and MXS they were the only ones that would last a full season with the top unlimited competitors and Rob Holland types. Obviously- Rob was a little harder on things than the average RV pilot. The mounts for the RV may be a different animal.
We had no affiliation with either company.