I just got my CCM HTL today. Installation was pretty straight forward. The local farm store did not have all of the fittings I needed, so I am using a mixture of straight and 90 degree fittings. Either way, it is installed. Have not fired up the tractor to start pumping fluid, but I thought I would share my info thus far.
Someone was worried about using the tractor-to-toplink pin. Both ends of the Cat II HTL from CCM are Cat II in size. Never paid attention before, but my factory top link is Cat I on the tractor end and Cat II on the implement end. I had to install a Cat I to Cat II bushing on my tractor toplink pin. No biggy. However, I thought I would tell all because of the issue above with the bigger-than-Cat-I pin size. If you can get a bushing for that pin for a Cat II top link hole, you are in good shape. No need to "drill" the HTL. Don't know how you would do that anyway...
For those that use a HTL, do you leave it on the tractor when you are not using an implement? My factory top link stowed away on a hook real nice, but my HTL will either come off when not in use or I will have to come up with a better stowage mechanism. I will probably just remove it.