Hi been a while since I used the Loki rubbers!!
The N80 is closest to H3N, and I felt that for the price, a sheet of N80 had better quality than a std sheet of H3N, and better quality than a provincial sheet of H3N at less than 1/2 the price!! It’s a very good alternative to H3 or H3N.
As far as speed is concerned I found it a little faster than H3N, but this could be down to the blade I used, compared to the one I used for H3N.
The Arthur series uses sponges that in appearance, are very similar to those used by Xiom, black cake sponges. The Arthur Europe (AE) is softer than the Asia version, so may be more to your liking, I also tried the Arthur Europe Diamond, which I think had the same sponge as AE, but has a completely non tacky top sheet.
As far as the N80 is concerned, would you be happy to use it instead of / as well as H3N? 😀