Great add-on. Had been using the free version for 18 months and it operated flawlessly. Have just upgraded to the paid version so that I can use some of the extra features - such as discount coupons. Excellent support too.
Absolutely fantastic! A MUST HAVE add-on for anyone who is serious about monetizing their forum. I've been using it for about a month now and instantly noticed that more of my members who sign-up are using the paid option.
This add-on works great on mobile and desktop, and I have yet to find any bugs with it.