I tried the module with 5 testimonials using the slider with 1 column. I found some things difficult.
a) Unfortunately the slider doesn't start sliding automatically. Only the first testimonial is shown. Only after pointing on the module with a mouseclick the slider starts running.
b) Also there is a long delay between viewing each of the testimonial articles (approx 6 seconds).
c) The sorting isn't possible. You can sort in the backend, but the frontend sorting in the module will not change.