I also have one of the AUTOTUNE Thunder MAX installed on my 04 FLHTCSE. I tried the harley race tuner, put nearly $1000 into the tuner and tune, bike ran like crap. Took it off and installed the TMAX and have never regreted it (im thinking its been installed for ~50k miles). I have swaped out pipes and baffels, cams, aircleaners, calibrated speedo for different sized tires, 6 speed transmission etc and never had to pay for a retune or calibrating accessory. Best money i ever spent on the bike. Fuel MPG improved significantly. I dont care about increased HP as i dont race it, i ride it, so i have never done another dyno to find out if it helped in that reguard. I just wanted a good running motor, that was reliable and i didnt want to keep paying for retune every time i changed out something. i have no experance with the latest versions or TBW, but i will never own a bike without an AUTOTUNE.