Awesome! Just got my first flat on Friday and on the rear wheel too. Hawaii has its own version of goathead thorns called kiawe, and one got me. Fortunately, the Supercell did a pretty impressive job of holding back the thorn and it just nicked the tube. I didn't lose any air pressure until I arrived home and pulled the thorn out. I was able to patch the tube without removing the wheel, which is a good thing because I could not get it to budge this time. The bike is at my LBS this weekend to adjust for brake cable stretch so I'm having him remove the wheel and take a flat file to the rear dropouts so it will slide in/out a little easier. I'm not carrying a rubber mallet in my trunk bag, but I am going to add Slime. While I hate flats like everyone else, I also see it as an opportunity to get more familiar with my bike.