I own an Arroyo but have never shot a Sheepeater. I really like the looks of it but have about a 31" draw and need to shoot one before I believe it would handle that draw length. The Arroyo is the fastest bow RER makes, and is also very quiet, smooth and forgiving. They will have one with a 50's style grip this year. Looking at Pete Ward's test of the Sheepeater it looks to start stacking between 29-30" draw as it gains 5lbs in that last inch, so the Arroyo probably offers some options if you have a longer draw. Pete Wards test of the Sheepeater at 10 gr/lb showed a speed of 173 AMO; my Arroyo shoots about 190 AMO at 10 but is 18 lbs heavier, so maybe the Arroyo is slightly faster. That said, Brent's Sheepeater is a design milestone just as significant as Adcock's ACS IMO, as no one's ever made a bow with that kind of performance in that small of a package (except maybe the first Sheepeaters).
Dave