Nice idea but not good in practiceAnonymous reviewerA good idea, esp for this price, but in practice these are very difficult to use and I would have considered other options if I'd known.
To set the height of these legs you have to get the leg to the desired length, then twist them to lock them. However you need to hold them incredibly still while twisting to lock so they don't shift in height. Since you're twisting them, holding them still is very difficult. 
Then as you twist to lock them they lose height, probably about 5-8mm. So you have to make sure you twist them all the exact same amount, don't overdo any one leg or your desk will be lopsided.
Then if you finish your desk and find one leg is lopsided by a couple mm, you can't simply untwist it to redo the height without disassembling the desk to try again, because the leg has to gain 5-8mm to unlock, and the floor is in the way.
I'm going to 3d print shims to level the legs up, but I would have considered a totally different desk setup if I'd known it would be like this.3
Olov Leg,It works as expected.Anonymous reviewerThis item was a very useful item.4
GoodAnonymous reviewerbought as I needed table legs no higher than 60cm. They do this job perfectly however I would have preferred for the legs to be straight and not taper at the end. I understand that they would have to when extended but I have them on the minimum setting.4
Sanity CheckAnonymous reviewerBought as I need a lower desk, and this is the only budget option for something less than 70cm. The table is wobbly when pushed against but so was ADILS so it's fair. Installation was a headache - you turn these to lock them them and they will sink in a little as you tighten them, and remember you need to keep 4 of them the same length for a non-lopsided desk. Made mine level eventually but if these ever sinks over time I may just go completely insane.4
Good quality Anonymous reviewerBought for additional support to table, works well. 5
Very good productAnonymous reviewerVery goid product that is easy to install and easy to adjust.5
Perfect Anonymous reviewerDoes the job for my breakfast bar Happy 5
Good height adjustment, but not for heavy weightsAnonymous reviewerAlthough somewhat fiddly to adjust, the height adjustment feature is very useful. As I was using two legs to provide additional support for a workbench, I am concerned that the leg will not be strong enough to maintain the height selected and will slide down when loaded.3
Extendable Anonymous reviewerGreat price for the table legs.  Being able to set them to your desired height has been ideal.  Very sturdy5
EXCELLENTAnonymous reviewerVery sturdy.5
It's a legAnonymous reviewerA bit fiddly to adjust
4
These adjustable legs are rubbishAnonymous reviewerThese adjustable legs are not up to IKEA's usual standard. They keep 'shrinking' down every time a little pressure is added to them. It is impossible to fix them to the required height and have them stay in place. I have had to replace them as the desk was sagging as a result. I would not recommend this product to any one.
1
New legs Anonymous reviewerNeeded to raise table higher than fixed legs and these were ideal. Seemed expensive compared to fixed, and no details (that i could find) on how to adjust - hence only 4 stars4
Unstable even when fully tightened. Anonymous reviewerThese legs have a fundamental problem in that the one central screw does not hold them tightly enough to the base plate to stop them moving, even when I tightened them as much as physically possible. Avoid. 1
Table legsAnonymous reviewerPerfect 5
Good Anonymous reviewerSturdy 5
Nice idea but not strong enoughAnonymous reviewerI bought these so that I could make my office desk the right height, but if you lean too hard on any corner it sinks down leaving the whole desk wonky. I'm going to have to replace them with the fixed ones because I'm spending too much time on my hands and knees trying to get the desk level.3
Just fabAnonymous reviewerBought these to support a work top, in a new work space ~ perfect! Just love how you can adjust the height! 5
IdealAnonymous reviewerI have a bad back so to have the desk at the height I want for a very reasonable price is great5
Bit fiddle to set up, but doing their job well so far!Anonymous reviewerReally liked the idea of having adjustable legs on a teenage boy's desk. My only gripe is that setting the correct height on all legs was rather fiddly to ensure the desk is completely level. Just takes some tweaking to get used to how the legs twist-lock system works. We altered the height before we attached the legs to the desktop, but then had to turn it all upside down and tweak them again. But once they're done, they seem to be stable...so far, so good.4