No pros or cons really. Try searching - you may find something.
However, the only feedback I see about this course here is their fake advertising posts where they pretend to be a user and post a slandering post about Veritas/Manhattan/Kaplan and then a shiny post about themselves. I usually delete them
Yet to see a real one.
Here is a post with overview of all the prep courses:
gmat-prep-courses-classes-reviews-ratings-and-comparison-78451.html