but unless you raise and lower constantly these should work great for you
583300
Half the price of the big box stores for nearly same product.  Can telll in the raising/lowering action that it is not as smooth as the more expensive options, but unless you raise and lower constantly these should work great for you.
1134298
You won't worry about them falling down over time.  these work, Period.
2874460
These do exactly what i needed them to.....raise my bed two  inches.  My bed still feels solid and supported.  If you need to raise your bed i would highly recommend these!
1738899
I Had no problem with these, as the other guy rated them poorly. I put them on used my torque wrench to snug them. They seem pretty sturdy to me and I weigh in at 225 lbs. None of these are made for a 300 lb man to stand on, but I have put them under a lot pf pressure, and have raised up on them when hitting bumps. So if you are nor any heaver than I, you will be ok with these. I really love them.
3024068
Cute - come up a little high for some shoes but for sneakers and oxfords you are good.
118300
I'm 6'2", and these did not stay up throughout my day at the office.  They came up just underneath the bottom of my knee.  I think that for some folks, these may be plenty high.  But for us moderately tall people, it's difficult to find socks that go all the way up, and stay up.
435271
If you have a sloped yard like mine these are not for you. They will work great for level yards.
3693309
It's a little wobbly when I add risers to use as a step but works perfectly for incline/decline bench (a little better than regular risers).
419817
I wanted to stack these up but was afraid they might be tippy.  They worked perfectly, I have three high and it is as solid as a rock.
608164
I am an adult using these and the foot pads don't seem large enough.  I have a size 9 women's foot and I feel like I'd have better footing and control if these had a bigger foot pad.  Also, maybe handles would be nice.  It's not hard to walk on these but they want to rotate and handles would allow one to keep them straight.  Otherwise these are durable, work well for someone at about 150 lbs, and even for heavier people.  They raise to be quite high, and go very low as well for people of all skills.  Still, bigger foot pads would be very nice.
2200744
If you hang them they would probably work well. The problem is they have to be perfectly level because the 3 slots where the top and bottom connect are open all the way through so if they are slightly uneven water gets up there and leaks through to the inside and bottom.
4708056
I actually purchased these to put under my work table legs to raise it to a more comfortable level for standing. They work perfectly for this.
796646
These actually work and keep shoes fitting the way you want. Be sure to read about how to adjust them to fit the way you need them.
4123024
Very happy with these. I have overhead structures in my yard I have these strapped to, and I marked with electrical tape along a few spots on the straps so the two rings match up (this may be too-sticky of a solution if you live in a wet area) when I change the hang-height - I have a marking for dips and one for my style of pull-ups. Eventually the mechanism will snap while under-pressure if threaded the wrong way even if it is holding your weight fine for a long time; this will not happen if threaded correctly. The ring material is not slippy and these are not going to break unless you are using them for fighting a sidewalk. I really think this is one of the best ways to play around like a monkey was meant to. Add in some leg work and you could probably get by the rest of your life with a pair of rings and straps.
1039762
These are great. I'm still really bad at them, but it's probably the best upper body workout you can get, and that's coming from a rock climber.

You may want to have some climbing chalk for these if you use them for a long session. Sweaty hands can slip off, since they are hard plastic, rather than the wood ones.
931586
These work GREAT!!  The only way to improve them would be to put the handles on the edge, so you would hold them like a tennis racket, instead of cymbals.  That way you wouldn't have to bend over as far, which is a strain on my big belly !
1282153
I do like them but they are super tall! So that is a little bit dangerous ha, don't used them that often.