My gripe with Addi's 16" circulars is: the stalk (needle tip) is a teensy bit too long, and it's hard to bend it around tip-to-tip for flat knitting or circular knitting. So combine that with the slick surface...you're killing your hands.
I much prefer the Knit Picks Harmony 16" set circs. The stalk is a bit shorter, the cable is a bit more flexible...no fuss, no muss.
That said, whenever I can...I avoid the use of 16" circs for small diameter knitting in-the-round. I prefer the use of 2-24" circs for knitting in the round.
Others prefer magic loop (not me) or dpn's (not me).
It's completely a matter of preference. No right or wrong.