All features work as intended, but I think it is better that we have more options in terms how much time should be allowed for domain resolution before giving up with an error message (or simply not resolving).
You can easily add other domains than just those provided by default - so far this works well! If you are looking something easy & effective then try out hetix tools first-hand :))) they do what their promises!! Very good tool which resolves DNS issues quickly without using external services like Cloudflare etc.,.