Thanks everyone, I appreciate the responses. Yes, I'll be looking at RS or CS systems for the next wedding season. I am currently using a Double Sling from OP/TECH USA and absolutely love it, but if I want to carry 5D+70-200 combo I guess would need to use the lens tripod mount and move to RS or CS system. I know there are posts about these systems right here on CR forum, so I'll check them out. I understand so far that the largest difference is that CS allows easy tripod mount without removing the strap. I also love that the CS harness can be separated into two parts for a single strap..