What makes this better then seo spyglass. Can I get a compare and contrast?
I'll try to cover some of the differences between SEO Spyglass and Backlink Miner (other than they have a few years head start!).
The biggest things they have that we don't are reporting/graphing features and multiple backlink sources. Although, funny enough, the backlink source we use is not used by SEO Spyglass. Reporting and graphing functionality is big on my list of things to add but not at the top of the list at the moment.
As for things we do that they don't it mainly comes down to metrics. Here are a few things we collect that they don't (to the best of my knowledge):
Title Rank - check to see if a backlink ranks for it's page title to gauge possible link penalty
Anchor Rank - checks to see if a site actually ranks for the anchor text it is targeting
Link network detection - using expired domains, purchased websites, adsense and Google analytics Id comparisons, and web hosts)
Search volume and CPC data for anchor text - to help determine the how commercial and competitive the anchor text term is (we use our own 87 million keyword database for this which we update monthly)
Spam Detection - we check for common spam phrases used in the anchor text and on the backlinking page to help identify pages that have already been spammed to death that you should probably avoid
Link Theme Detection - lets you see if a site has links topically and thematically related to the domain you are analyzing or a bunch of off topic links
Link Category - Seo Spyglass does this to some extent but we try to determine the type of link across a number of link types (article directory, blog comment, hosted blog site, bookmarking, classifieds, document sharing, forum, guest post, guestbook, infographic, paidpost/review, photo sharing, podcast directory, press release, profile, Q&A site, social/sharing, video site, web 2.0, web directory, wiki site )
There are probably a few more but those are the major things.
Thanks for the interest!