I had used it when it just come out, in beta, I think maybe 2015 or what, at that time, the tool is okay and I can indeed find some expired domains.
But the downside is, you must be very clever, and know many strategies, weird techniques to get feed keywords, URL, or you will find nothing. If you think, randomly input some keywords, and URLs, and you are done, you then absolutely wrong. Because there are a ton of bots scrape like you 24/7, how to compete with them?
If you think you are very experience, maybe you can give it a try. Or I would not suggest you buy it, just waste your time and money. Or you may try other popular tools like: domain hunter gather, etc...
The good: maybe hands free, no need to pay for extra tools, etc
The bad: you need very smart on finding right Seed keywords, URLs
The speed: I have no knowledge about the speed of the tool, I just know it worked.
Or maybe just directly buy expired domains from reputable sellers is much more quick and stable.