I got my Thermapen just the other day…SO much better than the cheapo Weber probe I was using. VERY happy with the purchase.
As for cooking temps, I use a somewhat similar (but different) method than RRP…I put my steaks on indirect at low temp (around 220 F) until the internal temp is 115. Then I take them off and foil them while I get the grill blazing to around 600-700 F, then sear each side directly for 45s on each side. Foil again and let them sit for 5 minutes to allow juices to re-absorb into the internal meat fibers and serve. Wonderful 🙂 Here’s a pic of the wagyu top sirloin steak I did last week.