Half way through the manual and have played with some of the presets. Although it's an old machine it's built like a tank and has a huge array of options. Sounds really good through the Mustang with the output option set to 'combo'. None of the usual Mustang high frequency bias is evident, lovely and smooth. 'Only' 35 user patches, but the Katana has just 10, and that is more than enough. I am extremely pleased with it so far.
No USB, but really I never use pedals to record directly anyway. Also has no xlr balanced outs, but this is not an issue for me either.