I haven't posted to this thread for some time....but I have accumulated a number of flights on the V4 over the winter, spring, and now summer. I've not finished compiling / evaluating data, but the V4 most definitely is a substantial weight savings over the V3 and offers similar or better performance depending on the motor chosen. Thus far, I've run the V4 with a Neu 1512-2.5Y and a variety of Kontronik motors - 650-83, 600-09, and "Dekker" wound 650-88, 600-88, and 900-97. My baseline prop setup from the V3 is 22x20F and 21.5x20R (with APC style tips, mods by me, from Brenner props) and that is what I have been running as a baseline on most of the V4 setups. This weekend, I tried some of the Falcon props - 23x20F with 23x22R. Bottom line - I like them! Compared to my baseline setup, I saw about a 10 amp increase (in air), same top speed, equal or better downline braking (I had to increase the brake percentage with the Falcon props), and was able to achieve constant speed presentation with less throttle work. The sound of the Falcons transitioning from brake on/off is much harder to discern. Overall, they might be a little bit louder in the air (larger diameter), but, the overall sound is more constant.