I'm on my third oil change using Ultra now as well. I'm really liking this stuff. I haven't done any UOAs on it but things I've noticed since switching to Ultra:
1. The engine sounds "different" its not really noisy, it just sounds more "aggressive"
2. The engine seems much more responsive. I'm not going to claim it increased horsepower, but the engine feels a bit "looser" and less sluggish during acceleration.
3. MPG did increase slightly. I was averaging around 13.4 mpg while using Castrol High Mileage. Since switching to Ultra my average has been 14.5.
Btw, this is in my 1997 Dodge Ram 1500 w/ 5.9L 360 Magnum. 193k miles.