Worked once out of the 10 times I tried, ...
928529
Worked once out of the 10 times I tried, it kept slowly throttling down which defeated the entire purpose. It's grip just was not strong enough. But it was $20 so mehh
4465676
One star is more than it deserves. Exchanged it twice none worked.
2961851
I ordered a total of 3 of these.  2 worked and 1 did not.  Sadly, I was leaving town for 3 weeks and by the time I returned to ask for a refund on the nonworking item, it was too late.  These are not costly, but it's still disappointing to pay for something that does not work.  I had noticed in other reviews that this is not uncommon....for some of them to not work.  I should have not taken my chances and ordered them.  Will look for a better, more reliable product next time.
1918378
First unit I received was not working, so They have to send me a replacement and it worked the second time....
4125030
Worked one time for about 5 min testing tried it the next day for first run and it didn't work.
3934450
only works occasionally. very annoying when it doesn't work on the first try.
1739781
Hated it. Worked once. and after failing more than a dozen times. I unplugged it and just switch the comp. back and forth.
3096389
I got this to recharge the batteries for my cell phone and gps tracker while on a ten day backpack trip on the A/T. According to the specs, it should re-charge four to five times. Did fine the first time. The next night I used it again and it drained down to one charge remaining. And that charge was unable to recharge the phone. That all being said, the next time I tried it it did better. Turning the phone off while charging worked much better.
180977
Worked the first time I turned it on and flew it inside the house. The second time I wanted to use it, one motor wouldn't spin and then it wouldn't sync with the controller anymore.
4915488
It doesn't turn on reliably, even the first time trying to use it-- sometimes you click and get a light, sometimes you click ten times and get nothing.
1210885
I'm so bummed about this.  It worked great a few times, very easy to set up and use.  But about the 4th or 5th time I went to use it (and I've been extremely careful with it) I had a big group of kids in the backyard ready for a late-night movie, and the sounds wouldn't work.  We were all very disappointed.  I'm returning it/exchanging it.  I had to go through the manufacturer because it's past the time Amazon will allow a return.  I have to fill out forms, send them proof or purchase, pay for shipping to return. We'll see how it goes.
1691456
Worked like a charm the first time.  Then 2nd time the alarm just started going off and the temp won't take.  Contacting manufacturer today, so I'll update my review to see how good the service is.
456610
I tried ordering this twice. One time it wouldnt charge and I figured it was a fluke. The second time it wouldnt connect to my iPad even though others with the same model say it works just fine. :( I think I would have liked it if I could have gotten one that worked.
737400
Worked twice,but failed 3rd time... I bought micro switches instead... Would have liked to use this perhaps if it was more reliable... Another option instead of this would be to a metal strip to connect the open wires instead dangerous yes but at least it would work ... This
1634067
Most worked fine. Only one out of ten was DOA.
1176403
Only one in the first ten disks worked on any device I tried them on,  Returned for refund.
3470790
I was pleased with it for the first 2 times that I used it, but on the 3rd attempt, the power would not go on. I did test it on different plug outlets,  but just couldn't get it to work at all. Now it's a nuisance, to pack it up to return, especially since I don't have a Printer to print out the return info for UPS.