I have all three types of Addi:
1) the
Addi Turbo (set-circs, not interchangeable)
2) the
Addi Clicks (interchangeable)
3) the
Addi Clicks Lace Long (interchangeable)
As far as the needles themselves go, they're great! Wonderful!
Just because I own the Clicks, I still use my 'set-circs' Addi Turbos.
The gold cord on the Addi Turbo set-circs has to be warmed in hot water to uncoil the curve. The new Addi Turbo set-circs have the blue cord. Curling isn't an issue. (I have one pair of them) But LYS's aren't going to de-stock their inventory of gold cords, believe me! Too much money invested. My LYS in Renton carries a little of both. As the gold cords sell out, her new inventory is blue cords.
The needles on the
Addi Clicks and
Addi Clicks Lace Longs are even smoother than the
Addi Turbos. Totally sensational! You wouldn't think Addi could improve the finish that is on the Turbos, would you?! But they did!
Here are two drawbacks on Addi Clicks and Addi Clicks Lace Longs interchangeables:
1) the sets are
expensive, as are the spare parts
2) the US 4, 5, 6 are
useless (there is a teeny bump all round where the shank end of needle clicks onto the cord...and it snags the stitches as they pass over that join)
I'm tellin' ya'....it is ANNOYING to no end!
The snagging issue isn't a manufacturing flaw. So sending them back for a new set doesn't fix the issue.
It's a design flaw. I traded in my 4's, 5's, and 6's at my LYS way back when they were new...but the replacement needles snag the stitches, too.
No, I don't knit tight. My gauge is spot on. It is the design of the join. The stitches created on 4's, 5's, and 6's are smaller than the join area.
With the 7's and up...the stitches themselves are large enough to pass over the join with no snagging.
So, here's what I do: I use my Addi Turbo set-circs when I need to use US 4, 5, or 6...which is rarely. Phew.
The
Addi Clicks Lace Long have an excellent sharp tip! The word 'long' is in reference to a normal 6" total needle length, as opposed to plain Addi Clicks Lace needles which sport a stubby needle length. I think they did that to accommodate a 16" cable for knitting in the round, or so they said.
The Addi Clicks tips are rounded, perfect to use with yarns that tend to split. Or if you push your stitches off the needle tip with your fingertip!
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I also own Knit Picks Options in nickel plated and Harmony wood. I love them to pieces, too.
They're relatively inexpensive, the spare parts are cheap, and the customer service is unparalleled.
I've never had a tip come unscrewed. However, I've had a cable total pop out, come undone, from the shank! And it's impossible to push it back in there. But this has only happened on the long 47" and 60" cables. It happened when I had 1,000 stitches on the cable (Log Cabin blanket project) and I was yanking on the blanket to drag the stitches up on the left hand needle. POP GOES THE WEASEL!
So be aware, the Options cables won't take that kind of yanking and tugging. BTW: they should have withstood this...cuz why else would a knitter be using with a 60" cable except knitting a blanket??? with a ton a stitches to drag along!
Knit Picks replaced my cables. But happened again a year or so later on another blanket project.

I didn't call back again. It is what it is.
Here is my recommendation:
If you can only purchase one type/set of interchangeables, go with
Knit Picks!
They're great needles, and priced right! You won't regret it.