Dennis, I think the guitars are very realistic ( they still need to be played correctly], and as for the distortion..don't forget you have insert effects available...and who has better guitar effects than Boss/Roland..

I have heard and played all of the harmonisers..and the Roland is in a class of it's own...both quality and flexibility..not Ketron, not Yamaha. not Korg..not Gem, not Digitech..and not TC Electronics...Some of these are good..but Roland is still the best..

Besides where are you going to find a "Scat" sound other than the Roland..