I have one from Yosemite Sam and Jeff in Pa. They are both excellent adapters!!! It really comes down to personal preference, I think. I've had Sam's since Christmas and have used it couple times pulling blades. I just unpacked Jeff's this morning. I can say that you will break everything else before you break either one of these adapters.
Sam's came primed with a light coat of black paint plus all of the clevis and hitch pins needed.
Jeff's is unpainted with no hardware. Jeff's lift straps(not pictured) are twice as thick as Sam's.
I can't recommend one over the other yet (And probably won't be able to until more testing is done). I want to get one of these from Xtereme to avoid pulling the bolts out of the rear.
I would definitely get either one of these before getting a stock one.
In closing I'd say get both!
EDIT: I forgot to mention both guys are valuable assets to this forum in their Cub knowledge and high quality products!!!
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Travis
1993 Cub Cadet 2064
1988 Cub Cadet 2072
1980 IH Cub Cadet 782 w/CH20
1966 IH Cub Cadet 102 w/K301
1961 IH Cub Cadet O
1967 IH Cub Cadet 102 & 122
JD 2155 w/ 175 loader