The Connectors have way too much plastic on the ends ...
344709
The Connectors have way too much plastic on the ends, making it very difficult to make a full connection with the terminal depending on the vehicle.
2272266
While the crimper and stripper work great, be prepared to order some real connectors as the ones included are junk! BEWARE... 4/20 cracked upon compression. They evidently are a plastic or composite material with a chrome finish appearing to be metal.
4851519
As an audio professional, I am committed to producing the best product possible. These connectors function properly, but are absolutely terrible. Even with my soldering iron on a low temperature setting (620 degrees Ferinhight, one of the lost temps you can get and still melt solder), the male pins heat up and start melting the plastic. Even with no contact between the iron and the plastic, the cheapness of the plastic shows when the pins start to bend and cut through the plastic. A good workaround for this issue is to plug your male ends into a female before soldering them.

Today I have found a pin that was soldered properly, but the pin itself snapped in half inside the connector. Thereby proving how terribly made these connectors are. I will never work with them again. They are a liability to my work and my good name. There is a reason whirlwind and nuetrik connectors are more expensive, and that reason is reliability.
115203
Each end is coated with the plastic protective film but they made it incredibly hard to find the edge to remove it. 1-2 minutes each cord time wasted. Very important to note is that the end is too wide to use with the IPhone that is in an Otter Box case. We bought these chargers for work, all the work phones have Otter Box cases, and none will work for us. I did take a finger file and shave a little from each side of the plug and it does work now, but again 1-2 minutes each cord. Total time per cord wasted = 2-4 minutes and for 20 cords is 40-80 minutes of time wasted making these operational for us. Just make a disclaimer that they don't work with Otter Box cases and maybe folks won't waste their time buying them if they use those cases.
1829002
The cables and connectors are fantastic quality.  I did read a review where somebody noted that the connectors are plastic (could have been here or for the other Elite Core 3-Pin to 5-Pin converter or the Elite Core terminator pack).  Not true.  The connectors are metal and great quality.  There is indeed a screw on cap which the cable passes through into the connector and that is made of plastic yes.  But you should not be removing cables by pulling on the plastic caps or the cables so really no issue at all.
2768191
I couldn't tell from the site pictures, but the bulbous plastic ends of these things make it extremely difficult to plug them in when the receptacle ports are close. I have a monitor with two Min DP's right next to each other (Dell U2414H) and it's not possible to plug two of these cables in next to each other.

I ended up ditching them for a different set of cables, but at this price it's not worth it to return them.
2838749
The ends of the plugs are very big, so big that they wouldn't fit into the plug because the plug is shrouded in plastic. These seem to be well built and I repurposed them so I will get some use out of them but if you need a slim plug this wouldbe a bad choice.
2256977
I thought that these connectors being marine grade would be special but they are regular aluminum connectors with adhesive lined shrink tubing. I bought the 18-22 size for use with 18ga wires and it was a loose fit and it took repeated crimping to get a good mechanical connection. Definitely a waste of money at twice the price of similar butt connectors.
3487859
Connectors are adequate, but overpriced. But it's not like I have a choice of electronic parts suppliers without paying penalties for S&H. I sure wish we had local Radio Shack stores again. The finish on these plugs is rough, with flimsy electrodes for soldering. But they do the job. I've seen better on websites for electronic parts suppliers, but the S&H costs are just way too high for the few pieces that I might order at one time.
1054824
The terminal screws on the one I received just tighten into plastic, instead of metal grommets like a better quality RJ31X jack I already had.  Therefore, there is a limit to how securely you can tighten the terminal screws before stripping out the plastic holes. This can do the job, but I'll look for better quality next time.
4316233
Good for a first set of interchangeable needles, but the cables in this set are seriously awful. Do yourself a favor, buy a ChiaoGoo *small* connectors set and a ChiaoGoo *small* interchangeable cable. Those are the best cables and the connectors will allow you to hook the cable up to the needles in this set. The fit isn't perfect, but it works really well if you can't fork over the cash for a set of high quality interchangeables.
3572485
Loose connection with MacBook power adaptor. The plastic used worse than expected, compared with the official one used by Apple
3165206
The connectors that came with one of my sets of wire cubes kept breaking, so I bought these connectors to replace the bad ones. While these connectors are much sturdier than my old ones, they are the wrong size. I have two different sets of wire cubes with different size wires, and these connectors are too big for either of them. I did manage to make them work though by wrapping electrical tape around the wires. Of course, now my one good set of old connectors don't fit over the tape.
2236747
Connectors bind up on themselves when you screw them in making them hard to work with.  Look elsewhere.
4371943
The connectors are not bad, but the pins are too large to fit in a perf board with 1.0mm holes.  I have to take a drill bit and drill out my perf board in order to put these connectors on it.  It should have listed the pin size.
4513126
The outer perimeter is out of spec and won't fit in many sockets.
3295993
As pictured, there are plastic covers on both ends of the clamp. On the ones I received, only the top/curved part was covered in plastic. The bottom disk was plain metal making them unusable for me.