I do a lot of knitting, and I typically have at least a half dozen projects in progress at any given time, plus a couple of older projects in Time Out that I prefer not to take off the needles. Plus I have some emergency packs -- worsted weight cotton and a circular US8 needle -- in each vehicle, as I can always start a new washcloth. Bottom line is that I am never going to be able to function with just one set of interchangeable circular needles. All of that to say - I certainly welcomed the opportunity to add another set to my collection. Prior to ordering these, I had two sets of needles that are my 'go to' needles for normal sizes (roughly US5 to US13), one set for smaller projects (US1 to US7), and shorties for sock knitting that also work for some other small projects. In addition, I have a couple of "back up" sets that I can use if my "good" needles are in use, and some random fixed circulars. Now, however, I have three sets of needles that are my 'go to' needles for normal sizes. This set (which includes all of the normal US sizes from US3 to US15 except for US10.5, and also includes a US2.5) also helps me in the bulkier and smaller end, which is fantastic. When these arrived, I put on the US10 (6mm) needles, and cast on a hat. The needles went on easily, and there is an incredibly smooth join. Using the needles to make the hat, they are fairly pointy, so they are really great for lace types of stitches - make 1, K2tog, SSK, knit or purl through the back loop, all that kind of thing. They feel good in the hand, and as they are metal, they are not really "grippy" which helps in knitting fast. The downside of metal needles is that fact also - stitches do slide easily, so it is easier to lose stitches on these needles than on bamboo or something. That is not an issue for me. After finishing that hat, I tried the smallest needle and the largest needles, and those went on easily with very smooth joins as well. That is where I usually find problems with lower quality sets: either the smallest needles connection is just off enough to snag the yarn, or the largest needles are. I tried the cord connector to make a super-long cable, which was also smooth and not likely to snag. Be aware that the cable lengths listed in the description are the actual cable lengths, so your 15.6" cable gives you a roughly 24" needle. I started another hat, this one using two strands of worsted weight yarn held together. I wanted to see how this felt, and it has worked out well also. After I got a couple of rows knit up, I switched the needles out for the included ends, as I was wondering how secure those would be. I think I could rough up my project enough to get a strand of yarn to come off the cable, but I would really have to work at it. The needles are kept on a stiff insert that does hold the needles pretty tightly. They are still easy to get out. I love, love, love how easy it is to read the sizes (which are all in mm). No squinting and turning to try to make it out. The cables have a little zipper bag, and the accessories have a little plastic pouch, and there is plenty of room in the faux leather bag for them to fit. So bottom line is: these needles are absolutely in my regular go-to needle stash. It is going to complement them quite nicely, as the other sets I have include: US5 to US17; US2.5 to US11; and US1 to US7. If this set included a US10.5 (6.5mm), I think it would be something I'd consider to be my 'perfect' set.