Much lighter, same internals as pikes, perhaps cheaper (I have the dual air versions and they were £300, you can get the QR Dual air for £230 not sure about the U-turn) very simple insides that can be services at home with almost no skill and just a couple of tools, ajustable so you can set higher or lower pressure for different applications and such like….
I personaly have never blown seals off a fork, the preasure is inside a chamber in the forks, rather than just inside the legs pushing on the seals