Cat 6 run cable rated for 550Mhz and uses 23AWG. Normal patch cable is 24AWG. So what's the penalty for thin 28AWG - we don't know. The electrical contacts are fine, but it will require someone with lab equipment/testing to tell us.
I use these for wired devices like video streaming, HDTV, blu ray, etc., since typically their ports are 10Mbps. I wouldn't use them for network drives or bi-directional data traffic where you want to stay close to 1000Mbps throughput.
Another reviewer said PoE worked but no data; sure, 28AWG is too thin for low-tolerance requirements.

I love these SlimRun cables and have started using them everywhere in our enterprise. I'm even using them with my Cisco PoE desk phones without any issues whatsoever.

Works great. High quality on the cable and connector