i don't own one but they have a good reputation as far as sound quality
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The FX are really good, and yes, you can turn off the amp models. Only problem is there is a large learning curve, the manual sucks and each effect is kind of hard to figure out how to adjust. There is a lot of options but unlike the other two floor pods they don't make it easy to adjust because it's hard to tell what you're doing.
Everyone does things their own way. You can turn the modeler off and just use the effects with the amp distortion or you can use the amp clean and use the modeler and the effects from the board.