He seems to identify a couple main attributes:
1) the power of lower than Hurricane BS
2) It is more linear, and doesn't grab and hold the ball as much as H3 BS.
3) The arc is short
I just tried a Rxton 9 national, with the usual boosting, and my impression is pretty much the same. The shorter arc is immediately noticeable, many even hit the net despite leaving the racket at a similar angle. The hand feel is more clear especially at lower power, feels like it's easier to activate. It doesn't quite have the insane grab and hold of the H3, but it's much more than most hybrids including D09c which I've used often on my BH.
I'd say the comparison with H3N OS is reasonable, but they don't feel the same either. Besides having a shorter trajectory than H3N OS, it also feels easier to engage. I don't really like the H3OS, as it doesn't have the dwell of H3BS and is too hard to hit into, so you need to hit very hard yet don't have enough hold to control the ball. I like Rxton 9 a lot better, though it's not an adequate replacement for H3N BS for my FH for me.
One thing about Loki rubbers though, is that their topsheets are really nice. Tacky, supple feeling, and quite consistent, unlike H3's. For that alone I think it's a worthwhile rubber to try. I'm thinking that it might actually be a better BH rubber, so if I have a chance I'll grab a softer sheet to try on the BH side.
There's also a new Rxton 9 Neo now, I might give it a try some time, with an eye especially on the 37 OS version designed for BH. The H3 37 is awful, even boosted it's just so powerless and mushy yet not feeling soft. I think Rxton 9 might be much better.