While these are a good price the gotcha is quality? This adapter came apart shortly after purchase during normal use. I attached it to an Adafruit RFM69 radio and all worked fine... after moving the radio and breadboard a few times I noticed the antenna and connector came apart. Odd, I thought.. trying to put it back together I noticed the ferule detached and I though "I am glad the radio wasn't powered at the time"I am not sure if they are all like this, prone to coming apart but I will keep an eye on them and am considering gluing them together.

These connectors are of a good quality. I have used many different connectors over the years. These fit perfectly for my applications. I have not tested them electronically, but based upon my usage they seem to be performing as I expected.