Their website states "All links are on UNIQUE C Class IPs and Domains". I can't verify how true this is, but that is what they state.
I put in a couple submissions because I was curious. Here's what I found...
Ran three submissions. From those three reports, I was able to identify 33 domains (the free report only gives you 12 of the 25 submissions).
Of those 33 domains, there were three domains residing at the same IP address, and the others had unique IP addresses.
There were thirteen unique subnets (i.e. in AAA.BBB.CCC.DDD, the CCC.DDD part was unique).
I also noticed that only maybe a third of the domains are well indexed in Google (20,000+ indexed pages). Most of them have a couple hundred or maybe a couple thousand indexed pages, and at least one domain was completely de-indexed.
One submission was about two weeks old. Of the 12 reported links (all of which do exist), only 3 have appeared in Google Webmaster Tools.
I've tried searching the forums for some good information on whether this service (and their other service, BacklinksKingdom) are all that useful and haven't come up with much. So I just wanted to share some hard data for anyone else who's curious.