I had an F50 combo. The cleans were really good, and drive channel could span from a light drive to raging fury. Think of it as an amp that took a Fender Deluxe Reverb as a starting point, and then added a beast drive channel. I liked the amp, but my back didn't....I sold it a while back to help finance a Mark V 25 head. In fat mode, the Mark's cleans are similar, although I wouldn't say the Mark's drive sounds are the same. Still, as much as I like the Mark V 25, I'd pick up an F30 or F50 head if one became available at a reasonable price.