Very disappointed, but glad to have tested it now
937108
Purchased two of these one year and three days ago, and one of the units is DEAD, no response at all when attempting to charge or turn on.
Purchased these as a "just in case needed" item, never "needed" it over the past year so it was never even tapped for power.

Very disappointed, but glad to have tested it now, before a long motorcycle trip.

Guess I'll be looking at some other brands instead of RAVPower....
1276614
I bought this in June and tested it to make sure it works but didn't install it.  Today I put batteries back in to get ready to install it and found it no longer works.  The button lights up when I press it, the sound box chimes when I push the settings buttons on its side.  But pressing the button doesn't trigger any sound at all.  This was purchased from the authorized seller so it should be a genuine item, not much luck finding out how to get it fixed or replaced yet, if it's still under warranty at about five months old.

UPDATE:  It turns out the AA batteries I put in the sound box were too weak.  Even though they were strong enough to sound the chimes loudly, they were not strong enough to receive the remote button's signal even when I tested with the remote button only a few inches from the sound box.  All is good now.
970292
I ordered one of these as an alternative to buying a Vitamix, mostly for cost reasons, but sadly I've been disappointed, twice.  The first one I ordered wouldn't even turn on, and yes I plugged it in. I returned it for an identical replacement.  I received the replacement 2 days later happy to see that the lights turned on when I plugged it in; however, when I tried to blend something....nothing happened.  I spent an hours trying to see if I was doing something wrong, but sadly I was left with another dysfunctional blender.  This last one only counted to four on the timer, would randomly shut off when I pressed a button other then off, and just plane acted wonky as if the programming was buggy.  Dare I return this one for a replacement?
3984228
I am really bummed because i was planning on using this at my air soft place this weekend. I opened up the box and i put the battery's in and turned it on. It worked for 5 seconds and then turned off. Have not been able to make it work and i'm really disappointed because most everything NcStar makes is of high quality guess not this time.
4291911
I was so excited when i opened this.  Light, simple... i had high hopes.

The s/w downloaded fine from the internet, but then after one scan (which did not go well:  screeech!), i got "Check Connection" and it hasn't moved again.  just this error again and again telling me to check my connection.

The scanner bar is no longer perpendicular (odd angle) which doesn't look right.  i think it got stuck on the cheap ribbon inside.  Based on other reviews, i think i need to try the cannon to see if the h/w is sturdier. i don't want a replacement that breaks in 1-6 months...  Glad this one busted on the first try.  Sending back to Amazon now.
643042
Didn't work, and I unfortunately didn't test before I threw out the packaging. Test it first!
3085931
Very disappointed.  Was defective immediately.  Had to send back
4360095
Bought this in June - charged it and set it aside for use as an emergency light. Hurricane Irma was approaching this week; made sure the light was charged. Turned it on a few times to test it - only used it about 6 minutes. Then the power went out; I turned it on for about seven minutes. It suddenly went off. I thought it may be a problem with the battery not charging, but when I picked it up it was hot to the touch. Tried several times to re-charge it; plugged it in and verified that the charging light was on (working off a generator now). Even with the charging light turning green it will not turn on; plugged in or not. . Very disappointed that it failed the first time I actually used it (and really needed it) Bought it too long ago to return it, hopefully the red tail light will continue to work.
134669
did not work, spend more but buy one with mostly good reviews
780294
At first I was very happy with this device, but I've recently noticed that the readings on dust are erratic.  I can be reading in my room, with a really great score showing on the machine, and moments later I'll see that the red light is on and the score has plummeted.  The first time I noticed this, I launched the app to see what was going on, and saw the dust reading go from zero to 80, then descend in increments until it was back down to zero, all in the course of a minute.  All of my doors and windows were closed, I was home alone, and I hadn't moved except to turn a page in the book I was reading.  There was absolutely nothing going on that would have kicked up the tiniest bit of dust (and there was no visible dust in the room, as I had thoroughly vacuumed and dusted the day before).  Since then I've seen the same sudden spikes in dust readings occur, with the reading returning to zero after a moment.  I don't have much confidence in the unit.
2877642
wishing I could return it, but the feature seems to have disappeared from Amazon....  tried it for the first time this weekend and it does not work at all!!
1037383
Initially when we plugged this in it worked very well and we were very happy with it. After about 5 minutes it froze - none of the buttons worked. We thought maybe we just need to unplug and start over, and still it don't work. We tried it again about a week later and it completely messed up our desktop icons and still didn't work. I had high hopes for this laser pointer and I am really disappointed.
3833025
Disappointed. Connector did not work.  Must be defective.
3891716
Update: it stopped working completely. Tested batteries, not that. Just broken.
599523
The first time I used it, it was magical. After that it didn't work. Very disappointed!!!!!
3707099
I was researching for a good can opener for my mom since all her old ones were too hard to use (In her mid-seventies and arthritic).  Read all the positive reviews and decided to give it a go.  The item arrived quickly.  It looked light and flimsy compared to her old ones, but I remembered the reviews saying how good it was.  I let her test it on a couple of cans right of way to see if she liked it.  It opened the cans easily and she was comfortable using it.  I thought, "Yeah!  Perfect."  One week later (and approximately 15 cans), I am talking to her and she mentions that the can opener no longer works.  Sure enough, when I went to use it, it would easily cut into the can lid, but it would not rotate the can, even though I was able to rotate the handle.  I looked at it and noticed that one of the sprockets did not turn, rendering the can opener useless.  I was very disappointed.  As always, Amazon accepted the return with no issues and now I am waiting for my refund and looking for another can opener.  Oh, well, maybe I just got a defective one.
2310196
Mine stopped working once within the first 24 hours of use, and had to be reset. Therefore I'm sending it back