Hey,
I use BMD almost every day and love it.
1. The auto account creation is what sold me (I use Tor and make a few 5 - 6 different log ins for all the sites)
2. It has a great random RSS feed poster, built in article spinner (of sorts), and a random login option that helps make your book marks look 'less spammy'
3. easy to pick up for the nube and advanced features for the pro.
4. Built in Ping feature that helps the spiders find your bookmarks.
5. The guy is always updating his program so new features abound.
In my option its worth the money. Snuke is another good program in the same field - but I like BMD a bit better.
Well, just my 2 cents