AJ...this is just my opinion, so take it for what it's worth. The adjustability on the Legends is great, they are extremely well made, and look good too. They are pricey though, so if you don't need the height adjustment, or you don't want them just to get that "slammed" look when parked, then there are equally good alternatives with regards to the performance of the shock itself. I can compare them to the stock Air Shocks, and there is no comparison. The stock shocks suck...if you're used to them, you don't know a difference, so ignorance is bliss. There are 100% improvements available though. If I had the Progressives already on the bike, and there was nothing wrong with them, I'd probably keep them. If I were buying new, I'd cough up the extra 200 bucks and go with the Bitubo shocks. I've got them on the Vrod...VAST improvement. Chief has them on his SEUC2 and says they are not only an improvement over stock, but over the Progressive's as well. Being able to adjust them 3 ways is really nice. Compared to the Legends, the ride quality is probably just as good, they just are not quite as flexible in application. But, I need the Legends because I'm short, plus I ride the Ultra two up 95% of the time, so the adjustability while rolling down the road is a big plus.
If you do Bitubos, you'll want the front end AK-20 cartridges as well. It's like driving a 68 Buick now...after these two upgrades, it's like driving an upper level luxury auto with touring suspension. No comparison...it's like riding a different bike.