I like that it is easy to use, you can have multiple scan options available for different vulnerabilities/threats in one tool! The UI could be more user friendly but other than this there are no problems so far when using HTS as part of my day job at work (security consultant). It's very good if your threat model includes threats such as web application attacks or social engineering through phishing emails etc., otherwise its not really useful since most people will block these anyway by default unless they do something stupid first which then brings me back around again :).