Purchased one of these for the M59. Very happy with this product. Joints have zerks and build quality is very good. Down side is it weighs about 900 pounds. I thought about this for a bit, not wanting to give up the 3-400 pounds of lift capacity compared to a lighter grapple but on the other hand, don't want to spend time in the shop trying to straighten a twisted grapple that was built too light for the M59.
I looked at the heavier duty Wicked grapple but the price was $1000 more and the weight was 300 pounds less. The Wicked looks like a super grapple and I would have loved the weight savings but this was also a concern, taken from the web site:
"Built for tractors weighting less than 7000 lbs with loader & loader capacities under 2500 lbs for the 55", for the 73" grapple up to 3000 lbs lift capacity."
The M59 weights 8300 and lift capacity is more like 4000 pounds. I think some of these grapples (as sized to to horse power) are with ag-style tractors in mind and not TLBs which have stouter loaders.