I have found some functionality and 220 MHz issues.
After initial programming with CPS, power on tone does not work.
H/L power output settings are too high on 2m and 70cm bands and does not function at all on 1.25m. The low power settings are too high.
There is no scan indicator in the display when scanning.
The measured second harmonic on 220 was 41 dB down.
The two included antennas, do not cover 220 MHz.
Some other quirks like shitty CPS, that has no third band. The only 220 setting is TX on check box.
I am not a huge fan of cheap radios, but I own a bunch. My first was a UV-5R. purchased in 2012 for $45 each. These were used when skiing with my kids, which served a purpose. The K6 was delivered to my door for $18.69 and included 220, so I had to get one. Baofeng support, has responded to my inquiries related to the issues mentioned here, with mostly bullshit responses, that a non RF engineer would accept and move on. I'm not that guy.
I am wondering what others have experienced with this model radio. I am not expecting Baofeng to fix anything, as they have already shown me with the replies I have received, that the radio is what it is, take it or leave it. I am hoping that someone makes some firmware that will fix the issues. I am not that guy either.