I’ve been using Shield since I first started using WP around 6 years ago. Security is my least favourite part of WP and the aspect that I find most confusing when trying to compare products. I did have a moan about Shield a couple of years ago when it didn’t pick up malware during a scan but I know people who were using a premium, expensive security plugin that also didn’t spot the malware (although another free plugin did in my case). However, I still trust Shield and have continued to use it on all my sites. The devs have done an amazing job with constant innovation and I’m amazed at what they offer for free. Their pro plugin is so unbelievably well priced that I bought a few licenses just to support them. I’d encourage anyone reading to go and buy even just one pro license to show your support. They deserve it 🙂