i tried this when m-audio/digidesign had a mixing clinic here in davao. all i can say is WOW. ang ganda. its one of the best digital effects ive had the pleasure to try. the reps were really trying hard to pry me from the thing. though some presets were so-so for me (presets ha. i didnt get to try it to its full potential), it had me sold on the SLO-100 model. i havent tried a real life slo-100 but it sounds good enough to my ears. meron pa ring konting digital-ness sa feel. (it lacks the spongyness of real tube amps) pero the sound could fool (or even impress) any tom, [sausage] or harry in a gig setting.
what you get with using digital stuff would be consistency i guess. if you want to sound consistently day in and day out at every gig, i think digital stuff would suffice. it can also go out to push an amp (ala distortion pedal) or go out to a pa system.
pinagiisipan ko pa to. lalo na kasi it comes with protools.