If nothing you should get the product for the unbelievable support you get from Nicholas. In addition there is a knowledge base you can use to try and find the answer to a possible problem.
As far as the extension goes, it has some really cool options especially in the WAF.
Of course, I went over the top in my setup (that is what I do) on that and promptly locked myself out of the site. No problem, I went to the knowledge base and immediately new how to fix the situation.
The builder of htaccess files is awesome, link to Bad Behavior use(search for Bad Behavior extensions, they were pulled from this site a couple of years ago because of a code issue with core Joomla! This software is running just fine), Honeypot implementation and more. You can black or whitelist specific ip addresses, as well as lock out entire country ips. You can plan for what to do if there are security exceptions; ban them after a certain number of tries, email you when it happens, and so on. Go ahead and google this extension to see what you find. I would be hard pressed to find something negative about it.
Don't be stupid, just buy it. I just wish all commercial extension people stood behind their product like Nicholas does.
I had what I assumed to be a template issue which was blamed upon the module by the template maker. In my experience in the past, this would turn into a battle between the module and template designers blaming each other. 24 hours after entering a support ticket at infyways, they had modified the module and installed it for me on my site! Perfect module for my needs, A-1 company. I am in the process of looking at what else they have available because of the service I was given.
Thanks, and good job Mike!