FCS is the most inexpensive comments addon available. And with the life time option, it is even cheaper in the long run. There is no comments add-on with more features. It costs thousands of dollars to develop this FCS add-on. I am not a "company" that is trying to "make living" with add-ons. I don't make this for money. If I was supposed to do this for money, I wouldn't do it at all. Because I don't make any money on these add-ons. And I don't even expect to break-even, ever. I am only creating add-ons that I need for my own use and have decided to share them here with the community for a negligible fee. I am currently loosing thousands of dollars on my add-ons. The peanuts I get from sales, although I appreciate it and I am thankful very much for each user that purchased this add-on, it's not enough to have a major impact on this add-on, especially when it comes to features I need and consider essential for this add-on. Basically, just for two fast food meals you can have two years of hard work worth thousands of dollars.
I have also purchased several add-ons for my website and then they hadn't work well for my website. None of the developers offered returning the payment. Because it is not possible to return a digital product.
And all those developers I have purchased add-ons from, I had to register on their websites as well. In fact I don't know any that doesn't require a registration.
But of course if anybody is not happy with the terms that basically every developer has, please do not buy this add-on.