I've owned 5 of the mod 7750 Daytonas, and got rid of them all. I always feared for their longevity; the 7750 was never engineered for the modification necessary to play musical chairs with the subsidiary output.
Having always wanted a Daytona, I opted to build using El Primero (16520) and Valjoux 23 (6265) movements. If I add anymore Daytonas to the collection, it will be more of the same. I just have a hard time feeling comfortable with the mod 7750, especially after Ziggy's evaluation on the movement...