First of all, OP, thank you for 500 credits to test the system.
I'll start with important stuff, the system works and reliable. I used to use a free system and needless to say the site is gone now and the rest of free systems are rubbish and very inaccurate and that's why I decided to test OP's system, and from what I've seen so far THE SYSTEM IS ACCURATE and it does the job.
I'll add my personal cons as it's about the backend.
1. I don't like it that I can't delete links, maybe it's EU thing where we feel like we should be allowed to delete any information about us.
2. I also wish it was possible to check any link rather than the whole project.
Overall, my issues are design related but I'm sure there'll be many people who will disagree, which is natural.
The main thing is that the system works.
Oh yeah, an important thing (for me)... the system doesn't use my IP address.