Used for 5 years, still using.
I've been using fraudlabs pro with our company's website for over 5 years now to protect us from fraudulent purchases. It's caught purchase that were definitely questionable and allowed us to review them. So far I'm happy with it. It's integration is slightly more cumbersome than other plugins I've used. And by that I mean that it's done 93% well right now and is not a deterrent to using it.