I installed this plugin because it was on the 'top plugins' list in WordPress.org daily updates, and am glad I did. I haven't yet enabled the security features, except to do a scan to satisfy my curiosity (no security issues), but I did enable the caching option.. just to the 2-3 times faster, not the 30-50 as yet. I try that later. But I am very pleased with the results that even this option gives me: It literally did (and noticeably) speed up the site!
I also like the live users feature, so I can see exactly who is on the site at any one time, and what they're doing. Interesting how much time the googlebots spend on each page!!
Overall, an excellent plugin, and I would recommend it to anyone.
Besides all that, you just need to look at the rating it's been given; 1351 users gave it all 5 stars, compared to not even 70 users (did they even use it?) who gave it less. Thanks WordFence, keep up the good work!!