Moen Buffalo BS-BA, what are your thoughts/experience?

I just purchased one of these babies to try out. Every now and again I need a nice D.I. or am too lazy to tote my amp to practice and figured for $66 it was worth a try. Anyone else have one? What are your thoughts? Settings you like? I'm not really sure about this speaker sim function, it doesn't seem to have a switch or setting for different speaker sims.