I have the denise interchangeable needles, and I really like them. They are plastic, so less clinking sound if that is an issue. The problem I have is that the cords break sometimes when I'm knitting blankets. I've had to get replacements for cords 3 times already. But I just send the old cord back after I contact them and they replace it so that's nice. I would love to try a metal interchangeable knitting set too someday.
Chiao Goo. Hands down. Addis are expensive and their cords will never lay totally straight but they're decent needles. Chain's on the other hand are more reasonably priced and have cords that lay 100% straight, right out of the package. I'll never use another interchangeable again. Love the safety line feature as well. I cannot say enough good things about these needles! I highly recommend you purchase a set of circular needles to compare the quality of their needles and cords before buying an entire interchangeable set. You won't regret it!