2016 R3R with Progressive springs in the front using 7w Belray oil. Progressive 444 -12.5in stock length in the rear. I first went with the HD springs in the rear. Mistake. They are oversprung. I'm 210lbs and I had the preload backed all the way off and couldn't get the right amount of sag dialed in. Even 2 up with the wife, she's another 115lbs, they were still stiff, which is crazy to me. Called progressive and for $63 they sent me the standard rate springs. Just received them last week, but haven't swapped them out.
The front definitely benefits from the progressives since the stock springs are way too soft. The progressives stop all the nose diving under heavy breaking. The rear is a great improvement also. Even with the oversprung springs, the 444s eliminate the knock you out of the seat feeling when you hit a decent sized bump with the stock shocks. I also found it very difficult to get a straight answer on the oil level/ air gap with the progressive fork springs. Seems opinions varied all over the place. Wilbers recommends 110mm on their website. I compared the length of the wilbers progressives with the progressive suspension springs and they were close, only a few millimeters off. I couldn't get an answer from progressive suspension, so I went with wilbers guidance and it is fine.