I find that toe-up socks are more comfortable to knit with a circular needle, while cuff-down socks seem to go better with DPNs (the toe-up cast on is awkward on DPNs, while the beginning of a cuff is almost equally awkward on a magic loop). The 80 cm long HiyaHiya circular needles I've been using seem pretty suitable for magic-looping. I would make the cord maybe slightly more flexible, but other than that, I have no complaints. They are so lightweight and yet sturdy.
I also found the yarn, Araucania Ranco Solid, very pleasant to knit. What's left to see is how the yarn holds up in use, since I've read some reports of it felting on feet.