How similar are these amps? I played the 5/50 with an OCD and liked it a lot. Is the 5/25 good with overdrive/distortion pedals? I don't want any mushing out. I also like how the "clean" channel also has a crunch setting. Does the Lonestar Special's clean channel have a crunch setting or is it totally clean? How is it with dirt pedals? I'm guessing the Express series has more gain on tap.