I like the Extreme mode a lot! For my ears it's a great next step in the Mark series lead mode evolution. I do mess around with the IIC+ and IV modes occasionally but Channel 3 of my MkV is usually set to Extreme mode and 90 watts, and the gain might be set anywhere from 9 o'clock to 3 o'clock depending what I'm looking to get out of it. This is actually my favorite Mark series lead mode yet!