I had a katana 50, they are very nice, and the well priced.

Quality build, good sounds, nice control system, and pretty light to carry around.

What I found with the Katana 50,(not the 100) is that you can not use the record-out at the same time as the physical speaker output, you get one or the other. Yes you can record via USB, while still using the cabinet speaker, but that recording seems to be pre-effects only. The 100 has a dedicated Line out, which would of suited my needs.

I record all my practice sessions into a DAW, but also want to hear/feel the raw amp sound at the same time, so I decided to upgrade to a Line6 Spider V 240 MkII. I know it's overkill, but sometime I just want to crank it up to 11, and have enough power to shake the walls.

Both are quality amps with nice featchers, but the line6 was just a better fit for me.