I'm going to make this as short as possible, because everyone has heard about these. It's basically an Axe Fx iii in floor format with less processing power. It's still very hard to reach that CPU limit unless you really try to specifically. It sounds absolutely terrific in all scenarios. The cab IRs are great and you have more than 2000 of them in the box. I use the device with cab sim bypassed in a 212 (v30) using a Mooer Baby Bomb. I did some AB with my Archon and the FM3 sounds and feels like a tube amp. No way someone would tell any difference blindfolded. The difference is that you can dial in a Bassman if you want to play some Chuck Berry, crank the power section of a plexi for some EVH or boost a recto or etc. instead of being limited to a few sounds. This can be overwhelming, but as long as you know what you are going for, it's very satisfying. The switching systen is well thought out. Long press for menu options or next page, quick press to select. Very usable live, but you might need an additional controller if you like more control over your effects. I do find that with the 8 scenes per preset you don't really need to switch the effects directly, you can just make a preset per song with a scene for intro, verse and etc that switches the state of all effects and parameters as needed. Quality is second to none, built like a tank. Edit: typos are my nemesis.