So, my burger expert son used Caveman to make Wagu burgers.
He used the bottom rung in the cooking section (third one down) for 2 minutes per side, and seared them on the top rung - they came out almost perfect, we go medium rare and they came out a little underdone so they probably need another 30 seconds on each side before searing. The downside was that he was cooking for 5 of us and a single Caveman doesn't have the capacity to serve 5 simultaneously, so we're looking at trying sous vide next time and searing on Caveman, using the drip tray as a keep warm option or maybe even buy another Caveman?
Unfortunately no pictures to share, I'll try and take food porn photos next time! He used Snake River Farms Wagu on this occasion, but we have found Wagu in Costco so will try this next time to see how it compares.