new pacbrake works well. Install was understandable but lengthy(5 hrs). Stock elbow is a squeeze to remove. The ECM is a reach to install the # 20 pin. Under dash wiring is a circus act. I purchased the switchpac shifter switch. It is a very firm audible click that should'nt get accidentlly bumped "on". Towing 16,500 total lbs. at 7% grade 6th gear (approx 2000 rpm), keeps me at 55 mph all the way down. Down shifting make the brake feel strong, especially in 3rd and 2nd gear at 2700 rpm. I don't enjoy all the down shifting around town, but I'm trying it. Yes, Pacbrake is worth the money. I don't think other products are $300 to $400 better in performance. Shopped around then went to Peirs.