I usually knit socks using the magic loop technique, I use an 80cm circular needle. I don't love knitting with DPNs, I find it easier to get a ladder between needles, the tips of the needles get caught in the cuffs of whatever I'm wearing and I lose the loose needle every time I put the sock down. The Crasy Trio seems to solve the ladder issue, the caught in the cuff issue seems reduced and the losing the third needle is still a problem.
It took me a while (maybe 10 rounds) to get used to these needles and work out the best way for me to hold them but once I did, I liked them. A lot. The advantage of these needles over standard DPNs is the stitches of your sock (or other item worked in the round) are divided over two needles, you use the third needle to knit with. Because there are one, or more likely, two less needle transitions, knitting with these should be faster and smoother than traditional DPNs. The joins between the needle tips and the short cable are all pristine - I have always found Addi needles to be very high quality. "