The original light racing bushings were redesigned to help fix the noise issue. They would go bad very quickly but have since updated them. I don't use them, so I don't know if the issue was actually fixed with the updated bushings.
In my opinion, aftermarket UCAs are a luxury, which have some nice benefits as well, but 90% of people who get them, probably don't need them.
Benefits:
-Poly bushings, these have their own pros and cons which you can weigh yourself. I myself find them to be better than rubber bushings and easier to replace.
-More down travel, even with light racing arms and their ball joint design will get you more down travel than the factory arms, but arguably not as much as a uniball set up, which even if it does give you more down travel, is hardly worth measuring I would think.
-Easier to change UCA bushings (I can swap the bushings out in my TC uppers in about 20 minutes taking my time without using any special tools).
-Some companies, like TC, Camburg, All Pro, have grease fittings for the uca bushings.
-Wider tires
-Correct alignment issues in most cases (they fixed mine)
-Most of them look pretty cool.
-Stronger tubular design than the factory stamped arms.
Cons
-Initial price/cost of maintenance compared to factory arms
-Poly bushings squeak after a while, but greasing and easy replacement fixes that.
-Uniball set ups can make noise, and generally uniballs wear out faster than ball joints, but again easy replacement fixes that. When a uniball fails it is not a catastrophic event like a ball joint failure. (Don't compare upper failures to lower failures though, these are two different beasts)
I personally have Total Chaos uppers and love them. I would say if you are looking to get the most out of your lift and factory style suspension, and have the money to spare, or need to replace the bushings/arms/balljoints anyway then they are a good worth while purchase that most anyone would be happy with. Just remember though, most people don't need them so you need to ask yourself if your truck is really pushing the limits of the upper arms.