I'll echo what others have said re: The Katana is a great amp, I use it everyday. I find the 50 watt is more than adequate, unless your ultimate goal is playing Arenas, you should have no trouble being heard with the 50. The only advantage the 100 has (I believe) is you can program in more presets (8 vs 4). Not enough of a gamechanger to make it worth it to me