The main issue for me with website plugins and themes is that they will inevitably need a tweak or two. If you have an author that isn't available or slow to respond, then that can ruin your business!
I will absolutely buy any product from UniteCMS author(s) as I have full confidence in the support! Amit was on the ball... right there within a couple hours and had it all fixed! He answered my questions quickly and was very cordial.
Again... feel comfortable and confident in buying any product that these folks support! I know that *I* will!!