Jimbow, when comparing my '02Patriot single to my '03 Patriot Dually, the Dually was 14 fps faster with a 523 grain arrow. My '04 Patriot Dually came from the factory with the cams synched and tuned VERY well!!! I've only shot about 100 arrows with it so far due to weather but I haven't felt the need to change anything yet. If the cables settle a little more and I feel a "double bump" when reaching full draw, I'll need to twist the cable who's cam hits the wall first. In my experience with the Duallys, it will only take a 1/2 or 1 twist to make them perfect When shooting my '03 Pro40 Dually during the break in period, I shot quite a bit with the cams a little out of sync and still had very good accuracy out to 50 yards, your results may be different though according to shooting style and form.
Good luck with your choice