It supposed to give better wicking and it does keep your juice from getting darker and darker. But it is harder to set up and once you set it up you are stuck. I'll like to set up with a drill bit so I can take my wick out for maintenance...and you can't do that with a U wick obviously. Since I was getting great wicking with a regular wick I didn't notice any improved wicking with the U-wick. Also since I leave my fill screw in I hardly experience any darkening of the juice anymore when vaping with a regular straight wick. So for me a U-wick was of no benefit.