I'm still dialing in my rise with the above listed setup. Overall, it rides much nicer at speed/descending but there are some things to note with regards to overall balance. As I mentioned before, I upped the spring rate by about 40lbs, which is just under 10%. It feels as if that I still need to up the rate a bit from there as I've been able to bottom the bike pretty well on 5-6' drops that have landings that aren't so steep. The bottom out events are much softer then they were previously with my coil shock and the stock link, but they are there and noticeable, which means that I need to either increase the spring rate or start feeding in more compression damping.
In addition, the bike is definitely riding lower in it's travel in general then it was before the link. I can only attribute this to the overall increase in leverage ratio. According to linkeagedesign and cascade, at sag (15-18mm), the stock bike would have a leverage ratio of ~2.6 where now, with the cascade link, it's at ~2.9.
All of this points to needing a general increase in spring rate beyond what I've already added. So, from my experience, I'd expect most people adding this link to need to add somewhere around 12-15% spring rate compared to previous. I also feel like you're going to need to add a proportional amount of compression damping as well. These are not really positives or negatives, just anecdotes for those following along.
What is definitely clear with this link, is the increase in stiffness of the back end of the bike. It is way, way easier for me to snap this bike into a corner or catch berm with the link + pre-load kit from CC. The bike has a directness to it that wasn't there before, and it's very obvious when you're riding hard across an off camber, railing the bike into a berm or landing from a jump where you went way too deep/long and land hard. Previously, I'd find that it would get a bit hard to keep the bike pointed in the right direction (say compared to my santacruz bikes in this situation) but that gap has closed significantly with these improvements.
More info to come as I continue to dial this thing in.