I received the DLX yesterday and used it today (I'm a novice with the chronograph) . I placed it the garage light conditions were like an overcast day outside, at first it wouldn't register but after a while I got it to work. I'm sure it was operator error. I was using my 2005 P-3. JSB Match Diabolo 8.4 grams 370 FPS, RWS Super-H-Point 6.9 gram 391-383 FPS, RWS Super Dome 8.3 358-331 FPS. I still have the paper work from AOA and the FPS are very similar. I've never replaced any o-rings or had any work done and it still shoots like the day I got it way back in 2005!