I put 444s and monotubes on my bike ('12 FLHTK) back in November, and can only say that it is a different bike altogether.
I specifically went with HD springs since I ride with the wife quite a bit, and when solo I like the extra firmness. That extra stiffness is not for all, to be sure, but it works well for me.
The 944-4020UT is the HD which came out from Progressive well before the -4002 which has the lighter spring for lighter people/ loads. I don't run anywhere near full weight, probably nearly 200lbs less than max. I have the "HD" version (944-4020UT) and don't find them to be over sprung at all. I have not tested or even ridden a bike with the -4002 version yet.
103" w/Race Kit,Stage IV 117HP 111TQ
SE 259E Cams
SE Heavy Breather AC (Scott's modified)
SE Race Tuner
V&H Power Duals & Hi Outputs
SE CNC Heads 10.62/1 w/SE 58mm TB
John Scott port matching
Renegade Racine wheels. 21x3.5/ 17x6.25 http://www.harley-davidsonforums.com...845-petew.html
Got my shocks and front fork springs in today, only took me 3hrs and thats including digging out the craftsman jack from behind all the boxes.... love them so far, got preset set and gonna take the wife for a srive and aee how she likes them.