Cory if you prefer metal needles, the nickle plated are fabulous. The key to tighten the tips, especially if you use something rubberized while attaching it [rubber shelving, jar opener, sewing needle puller]. The join is as smooth as if it isn't there. If you are unsure and don't want the spend the money on an entire set, buy a cable and some needle tips to see how you like them.
Actually Peggy that is exactly what I did. I bought one set of 32" cables and #17 Harmony tips. Then I ordered a few smaller harmonies and then some even smaller zephyrs. (Never tried the NC because I knit loose enough that I fear stitches falling off). Now I know I want the full set of harmonies. I was initially reluctant to buy the set because I had collected so many fixed circs already. But trying convinced me.