Sounds great. I use Red 1 almost exclusively, with the stock speaker. I don't get the hate about this channel - it sounds good to me and is very useable as a hard rock distortion sound.The amp can sound pretty dam good with some tweaks I just installed some JJ tubes and a Celestion V-Type in mine, solid sounding in the room with nice bass and mid response... plenty of cut!
Here is a little sample that I recorded with a Tascam digital recorder about 3' away to give you an Idea of the tone, sounds way better in the room!
I dont use a ton of gain but this is Lead 1 with the gain on 6