Since there are just the new mics for the pro version, I can't say generally, that it's worth it. I think it really depends whether you would use them enough and if the difference in color is good enough for you. It's probably hard to decide that without proper comparisons, I still got one for the alt mics here:So is $300 worth it for some extra mic positions or is there more than that?
I found the stage mic to be the most interesting and useful of the new mics, so I'd be up to make another comparison between the tree and stage mic, if anybody is interested.
Also, the stereo mixes should be useful to save RAM, but to me they don't seem much different from the single tree or stage mic for example. I'd be curious, if others have different impressions, though.