I recently had my Fox Float CTD Boost shock into Fox because I though I was having an issue with the compression damping not working in the three modes. I spoke extensively with the tech about shock tunes and have determined that if I wanted a firmer tune, I would just send it into Fox to have them change out the components. Why? For one, the cost is really about the same, possibly less than the aftermarket tuners, and two, if you have another other problems with the shock and you send it into Fox, they will need to pull out the aftermarket parts and replace them with Fox components anyway. After much discussion, I've determined that my shock tune is fine for my riding style and the trails I ride. I just upped the pressure to 275psi for a nice firm ride.