The first template I have succesfully installed and used to good effect. In fact I am going to purchase the paid for version based on my experince with this.
The paid for version allows you to give detailed results to users whereas the Lite version just gives a summary of how many questions the quiz taker got right. But the good thing with the Lite version is that you can see how the thing works before you pay your money to get the full version.
I particularly liked the fact that when you select Menu Manager to add a new item, Ari Quiz is listed as one of the menu alternatives. Simple even I figured it out.