Usage is relatively simple, for against, as always, as there are a multitude of possibilities, it is still often put the nose in the manual, which is fortunately clear.
Only the instruments do not seem all very realistic, especially the guitars and brass, some wood. The organ and piano are well. But once placed in the mix, it is very correct. The pieces offered are varied and some are very nice and reminiscent of well-known pieces (House of the Rising Sun in particular).
Before this unit, I used a Boss DR3. But improvisation is quite limited in that there is no harmony. The advantage of JS5 is to provide two additional instruments, which will play the harmonies, which obviously makes the game more exciting really. I regret that he not play the points midday. I dream of a device that would read with a good one writes his scores on the computer. In the end, a device for improvement, but I could not find better ...