progress is a new product , so its hard to say which is best
mostly its all on how you drive , and what size bar you want , addco has both 19mm and 25.4mm (3/4 and 1 ") rear bars , and according to that auction the progress is 22mm
if you didnt have a rear bar already , id say try it , but you have 1 so to me atleast its not worth the money to try it
but the decision is all yours , and you could atleast do a compairission write for us here so other that ask the question will have better answers than we can give you now
hope my ramblings kinda help you , LOL
That bar I don't think is a new product.
Well, not the "Progess" bar anyway.
Some one some time, years, ago posted the Progress vs RK sport rear sway bar.
Had a photo album and everything.
That Progress bar mounts right on the rear axle beam frame.
If I"m describing it correctly.
But I've seen that bar before I think.
In Seafoam green/blue.
-M
Remember....syringes go in the RED waste basket.