I have to input my experience regarding Valhalla and Tyr.
As someone who has Tyr 2, and Valhalla 1, I find the Tyr 2 to be quite good, and quite a jump over the Frey 2, which I had for many years. And not nearly as "thin-sounding" as Valhalla 1, which has a suckout in the upper bad/lower midrange area (that's why they came out with the Series 2 cable). Even Harry (HP) heard it when he got Nordost's new Odin cables and stated he hadn't realized how "threadbare" the original Valhalla was.