Perfect when you only need the most basic fields for a form and don't wanna wade through millions of settings. Clean markup, easy to style with your own CSS if you want to, and not bloated down like many other plugins.
Not getting full score because it could be a bit improved UX on the setting page. The text/labels are a bit too complicated like "Uncheck to activate" which feels un-intuitive. And the Captcha/"Challenge questions" options should've been group because I wanted to disable them all and had to look around a bit. Minor things only, but keeps the 5 star rating away.