I am too - I just recently acquired it. MNF just updated recently and now their LSI component is up and running - that's priceless.
I don't think MS has an LSI component (haven't used all the features).
Another tool I've found is great is SEO Powersuite's Rank Tracker, since it pulls from more than Google for KW's (like WordTracker, Bing, plenty of other places).
When I asked, though, I was wondering if there were out of the box methods - not software driven (like I'm prone to, only because they're time savers).
Thanks for dropping by, and I think MS is definitely one of the top tools on the market. :)