Wow this is amazing!! I was day dreaming a while ago about Moz creating a tool like this, you must have read my mind! 
Thank you for the 300 queries per month for legacy $99 members, much appreciated!
Just one bit of constructive feedback, I'm wondering if you should maybe make it more clear (maybe in the more info snippet) that volume is currently all US based? This did have me scratching my head a bit at first, as I'm UK based, and I'd just assumed that when I select UK, the volume would be UK, I realise now that this isn't yet the case.
With regard potential score, how is it able to determine the potential for anything other than US searches given that the volume will be incorrect for anything other than US, and I assume that volume is important when it comes to calculating potential?Also when there is no data for a keyword, how can there be a score for potential since the volume isn't known?
The only other bit of feedback is that there's a lot of "no data" for terms that I can see on my GA stats have hundreds of impressions per month. Is this just because the sites I work on are UK based and these terms probably don't have any searches in the US?
Thanks!
Kev
