Sturdy but not too heavy
931519
When I looked at these my back was killing me (pinched nerve) and the last thing I wanted was one that weighed 80lbs. This one was lighter than the others I looked at so I decided to try it and hope it was not too flimsy. It was perfect.

The pipes that hold it up are about 1 and 1/4 in diameter, made out of strong metal and don't appear likely to bend. The instructions were terrible and tell you to put the handles on backwards. Use the Amazon picture as a guide. The nylon covers that protect you from being pinched are also rather mysterious as they have long straps that would seem to have some function but don't. Other than that the unit works well and adjusts to different heights.

Be sure to adjust it to your height because if you don't, the unit won't come out of the upside down position as easily. Normally all you have to do is place your arms at your side to be in reach of the handles and able to right yourself. After using the unit for a week my back is 100% better.

For those of you who are thinking of using this for ab work, it does not work for that. Trying to bend causes the unit (as it is supposed to) to bring your feet back down.

After being in pain for over a month I HIGHLY recommend it for back issues. Be aware that you may have some muscle pain at first, especially if your issues stemmed from carrying heavy loads on one side of your body. Since the muscles are contracting unevenly, stretching them out can cause some mild discomfort. This is worth it when compared to the relief it gives. It stopped the pain my back after only a few minutes.

UPDATE: This did wonders for my back in a very short time, but I want to add that it DOES NOT fold up very well. It is extremely bulky and hard to store. Also the rubber tips come off of the legs if you try to stand it up after you fold it. This can put some nasty scratches on your floor if you aren't careful.
2479286
Needed something sturdy but not too expensive. Easy to put together and has lasted. A good value for money and easily supports our 24 inch tv.
2467325
It is sturdy.  It was fairly easy to put together.  It doesn't take up too much room and is fun for the whole family.
1684551
You would think that this product wouldn't amount to much but it is very sturdy.  It looks harmless but it's quite worthy.
1295988
We bought this for the beach.  It is well made, sturdy, but not too heavy to lug around in the back of the truck.  The base is a little narrow.  You have to be careful placing things on it, making sure to balance it well.  I was able to put a medium size cooler and four beach chairs on it ok.  The straps are useless.  Use bungee cords.  It folds down to a small, almost flat shape so it does not take too much storage.  Very happy with it, has saved me from making multiple trips back and forth.
4877714
Feels very sturdy without being overly large or heavy.
I expect this to last for many years.
4080006
These are pretty nice and sturdy and I like the rubberized wire of the stand.  I have a large octagonal plate (about 12") on one and it  seems kind of iffy actually.  This plate is not one I would like to fall over so it is in a case NOT out in the open.  These are ok for smaller plates or would be great for holding a medium book.
75127
not as sturdy as expected but saves the weight and my dog used it right away without being scared of it.
4586128
Pretty sturdy. They're not very fragile and also you get two which is nice. Good quality. Very well made.
2009503
This is a nice case, but it's not "hard." It's sturdy, but will flex with light pressure. Just a heads up!
3413945
Plenty sturdy. I have one side up really high holding heavy items and the other side is lower holding slacks. The rack is full and there is no indication that it will tip over or break.  Sturdy corners/connectors. Bought one similar at Walmart and it broke in two weeks.
508564
Bought this stand not really to actually hold my weight, which it would, but to put my tools on and roll around the job to hold tools while I do trim work.  Sturdy enough, but not really really heavy duty.  For the $$, a great buy.
89288
It is just the right size for my 9-year old daughter - price was reasonable, it is not too heavy but very sturdy.
2798216
It is strong enough not to bend when heavy things are put on it-- that's what I was looking for.
4715136
Good quality but could be a little heavier.
4331926
Sturdy but not heavy. Easily secures the cat/ terrier
3118176
Not quite as sturdy as I had hoped, but it will serve as long as it is not overloaded with heavy stuff.