I have heims on the Hotchkis adjustable UCA's on my Challenger. I never had a problem with ride quality or noise, but the first set only lasted 7k miles before the heims ended up with galling and wear. Hotchkis replaced them and provided the "boots" that cover the heims, which weren't originally provided. So far no issues on the second set, but I don't think I've put much more than 7k on them again since I've been putting most of my miles on my Duster.
My personal opinion on them is that they're not at all necessary for street use, and that they will not last as long, even with the boots, as a set of bushings. Maybe if you only drive your car when its dry, sunny, and 70*F, but since I drive my car year round and in all conditions I don't expect nearly the same life span out of the heims. And pulling the UCA's and installing new heims every year isn't on my list of fun things to do.