Broke with the 1st use, NAC made it right.
587377
The blade of the stripper broke off the very first connector I was putting together. The supplier immediately replaced it, sent it out next delivery.
843112
Very happy to have this organizer, but upon first use, one of the nubs that hold a bin in place just fell out making the drawer too unsteady to use. Possibly broke in shipment? Definitely going to handle with care when using this item ...
1748242
After about 30 uses, the threading on the part that pops the NO2 cartridges broke. Now the piece can't be removed. Looking at the other reviews this seems to be a common and very major problem that needs to be fixed.

edit: Inovee has been very accommodating, they've both issued a full refund and sent me a new whipper. They have also informed me that they discussed this problem with their manufacturer, and that this problem has been fixed.
2217893
The quality is disappointing.  It broke upon the first use.
1753081
Had a problem with the first order,it broke the first time I used it,your company replaced it ,no charge,for some reason the welding came apart on the retriver part,in the water. the second one works so far,no problems!
3872566
I really liked the price, presentation and accessories but it broke the first time I used it. I think it was my mistake because I didn't tighten it as much as it needs. Just be careful with that and I guess youll be fine.
2953343
worked great the first time, had a crack in the green base by the second use. Ive owned it 1 month.
3225720
This tool and I had a rough start together.  I took the calipers out of the case when I received them and turned them on to make sure everything worked.  I loosened the screw that keeps the adjustment piece stationary and rolled the adjustment wheel slightly and POP, the flimsy plastic housing broke right off and the wheel skittered across the floor.  I considered boxing it right back up, but instead spent 10 minutes molding a piece of kydex plastic I had on hand to make a stronger mount for the adjustment wheel, and then affixed it to the calipers with some epoxy.  So far it's working just fine, even if I uglied it up a bit with my fix.  For such a low price, I wasn't expecting it to be bullet proof, but the adjustment wheel is a pretty important component to break just seconds out of the box.
1796457
I liked it for the pour spout but it broke the first time it got knocked over. I requested a refund which they gave and told me just to keep it. Okay.
3609939
The clasp on the collar broke the first time I put it on my dog, and the unit fell off and cracked. For what it's worth, the vibrations did seem to redirect his attention for the half hour we were able to train with it.

Edited... was contacted by customer service and they offered to send out a replacement. I am looking forward to receiving it, but I do plan on testing out the collar and, if it doesn't feel sturdy enough, I will attach the receiver to a collar I have at home.
2433569
I purchased this several weeks ago (here), but only opened the packaging last night for a test fit.  So glad I did prior to actually putting it into use!  I took pictures of the results to send to the good folk at Let's Go Aero to illustrate my findings.  I'm hoping this is a somewhat isolated event and they'll replace it.

Several people mentioned metal galling, and I did intend to grease the assembly prior use.  The mfgr doesn't suggest doing it, but others found it to be a good preventative/recovery method.  Well, unfortunately I read those reviews weeks back and then forgot my plan last night!  Huge mistake.  Using only the supplied wrench (and the pictures show zero surface damage to the nut or micro wrench, the threads galled and getting it apart became nearly impossible.  But once apart, I was sure it was the nut that had failed and that the two rounds of threads in the center portion had transferred metal from the nut.  But when I attempted to separate the buildup from the threads with a blade, I realized it was actually a section of the bolt that had 'smushed' and wrapped into the next channel.  There's no way any mere mortal could put 40 lb-ft of torque on the assembly using the toy wrench, so this is just tragic.
1728718
Light blue band broke on me the first time i used it, could be an unlucky manufacturer error but i was looking forward to having 2 of each

edit: refund was offered almost immediately and process was effortless
587120
It broke with the first use. The little bar at the end broke off, and when that happens, the measuring tape is off by measure and is completely retracted all the way in, which means you will need to pry the item open and pull out measuring tape. (BUT it's off by 1 inch since the little bar broke off)
2160988
broke after 1 month, but great while it was in tact
501051
I loved the idea of the jack...but it broke the 1st day of use.
3223040
Mine broke so I had to send it back.  That could've been a fluke, so judge the one-star accordingly!
3619394
broke first time using it.  I would not buy again.