John...since I've never ridden the Progressive shocks, what you're saying is that the Legends feel better than the Progressives? I would hope so for the money we paid for them, but I have nothing to compare to. Good to hear your observations! 
Terry,
Do not know if its a matter of better but different. I guess a far a feel of rear end alone, the legends are more like an lexus sc 430, the progressive have more Z51 corvette feel. Its a matter of taste. But I guess what surprised me was the legends tends to make the wallowing feel ( loose, soft, whatever you want to call it ) more noticeable than progressives. So if one were to keep the stock front end with fork oil change the progressive tend to cancel out some of the feel. When I get the Traxxion system next month (since I will ride to ATl on stock, and return on Traxxion, will compare the front end feel in combination with the legend rear system. It was pretty cool that the mechanic "loaned" me the progressives from his shop while legends got repaired, not often get that kind of comparison of products directly.) So i guess have said all that if one were looking to "economically" upgrade the rear the progressive would be a very good choice. I still like the legend for long hauls, 2 up, and full loads, but sure can't fault the progressive. As is often said just MHO. john
PS this may be one of those component matching things that Spiderman preaches about!