I was looking for a way to add subscriptions to one of our client's Joomla! sites and found this extension. Based on the previous reviews, I went ahead and bought it. The entire process was painless and I had it up and running in less than ten minutes. I had to do a manual install because my server isn't configured correctly, but the extension installed without a hitch.
Once I got it installed, the configuration documentation walked me through exactly what I needed to do to get up and running.
I added a few subscriptions and tested them by subscribing with my PayPal account. It worked perfectly the first time exactly as it should. I then unsubscribed from PayPal. Not only did I get an email from PayPal, but I got an email from the site telling me that my subscription had been cancelled.
I ran into an issue with the extension and posted on the extension's forum. I had an answer (and a solution) in less than an hour.
I highly recommend this extension if you are doing subscriptions on your site.