My group rides are races, but I race as often as I can so they are pretty frequent the rest of the week is reserved for recovery rides or specific intervals. One thing about doing intervals instead of going to the group ride and hammering yourself or others into submission is that with intervals you can target something (think weakness) and really focus on it. Group rides are pretty much tempo and then anaerobic capacity and sprinting. Good stuff but you don't get a ton of work right at threshold typically. Also anything above threshold is harder to recover from so doing tons of group rides can put in a hole pretty quickly.
Since this is a e bragging thread and since it's fun to see where everyone is heres my sprint #'s.
Max power 1715w
5 second power 1534w