I love circular needles, and use them even when not necessary. I'm also one that hates DPNs so I use a long circular needle and do a traveling loop, or sometimes two circular needles, when the circle gets too small.
I got a set of the interchangeable needles with multiple cords for Christmas one year. I asked for them because I love the idea, and a friend had a very nice bamboo set that I was envying. I ended up hating them. They are aluminum/stainless needles, which over time did NOT become my needle of choice, and they attach with a small screw-on connection that will NOT stay tight. The movement of use gradually loosens the join, creating a small slot that catches the yarn constantly.
I then discovered some cheap sets of circular bamboo needles on Amazon. Each set has every size needle, all in one length. I have sets in 3 lengths, and need to order another shorter, hat size, set. I love these and they are my go-to for everything.