Some problems it finds don't have a clear answer for how to fix them. The forum doesn't have answers either--it just sends you to email support, who may or may not get back to you. It would be helpful if answers were put in the forum or in a tutorial. Such as how to fix broken links it thinks are there but don't exist (ones that somehow end with ...link/%3C, or how to fix email addresses used in form submission code. Also has answers to see the website developer, which don't help if you are the website developer. (How does one prevent source code from showing when someone asks to View Source?)
It does find things I can fix and lets me know about other security items to fix.