It is a very nice bit of magic. I've been using it for years, and I don't think it has ever given me a false positive. Plenty of false negatives though, but it

It is a very nice bit of magic. I've been using it for years, and I don't think it has ever given me a false positive. Plenty of false negatives though, but it tells you. And then you just fall back to what you've been doing anyway. It is literally a tool that has removed a fair amount of tedium from my workflow.