I like that it's easy enough, yet powerful at checking your own blacklist status as well! It doesn't have any features in which you can only use if someone else is using an API key from their service provider (such us Cloudflare).
If they do add those services down-the road then we will be able see them but currently there isn;t anything of this nature so no complaints here except maybe some people would prefer more options than just being limited by what others are offering instead allowing users full control over all aspects? We utilize both our personal server & cloud hosting providers with different domains/IPs attached each time one goes offline or changes its DNS settings etc., having access through multiple devices was essential due to network outages during off hours when most other solutions require me manually logging into my account online - not ideal since these sites don�.