Bought 2 packs of 5 so far 5 used and one of the 5 was bad. I ran a cable through my attic into a patch panel and then into a switchboard and got disconnects and very slow 20Mbps speeds. I tried replacing everything in the chain except the adapter as I didn't understand that a bad adapter could result in slow speeds. I figured it just wouldn't work so that was the very last thing I checked. I wasted a good hour and a half of my time with a bad Keystone clutch. As soon as I replaced it with another one, everything worked beautifully, my internet speed jumped from 20Mbps to 175Mbps and there were no more connection issues. Worked 4 out of 5, 4 stars.