I certainly prefer the refined look of the Tune QR. For me they're little works of art.
Everyone to their own regarding looks but when it comes to weight you can't argue with fact. My U20s are under 20g, they weigh 19g which is 10g lighter than the Extralite. That's 50% lighter which puts them in a different class.
In fact I'd go as far as to say I would rate the U20 QR as one of the best WW products available, possibly THE No.1. They are beautiful but also hugely powerful but easy to close and release. Also they don't have those annoying little springs that most QR have.
10g / 29g = 34.4%, not 50%. Personally speaking I'm wary of a skewer that goes that low, even though I know that's based completely on nothing but personal perception but for a 10g difference I'm fine with that (blasphemy, I know :p).
...not sure what I want to do with it.
The C59 as it is lighter by about 0.10Kg