Easy to use, easy to install, great instructions - done!
This is one extension you don't want to cheap out on! I had this module installed and running in about 1/2 hour, including reading the instructions.
I bought the lifetime support, and this is something I will never regret.
Although there is no version 1.5 support yet, I'm using it in legacy 1.0.x mode, and everything seems to be working OK.
The developer's financial model is to create free software, but charge for the user's manual. I still haven't figured out how to do the more detailed functions, so I wouldn't recommend this software if you get frustrated easily.
All-in-all, this is a good application that can take your website to new heights, but you have to be willing to shell out some cash, or wait days for answers on their forum.