I've been fairly underwhelmed with fan conversions of the old settings that I've seen. It seems everyone that does them isn't happy to "Leave well enough alone and just upgrade the stats."
What I mean is that in the conversions I've seen they are untrue to the origonals that I had (though, perhaps I didn't have all the material, or the newest version, whatever) but it seems like they all include "someone's stupid idea that they think is really awesome" but was never in the origonal. (I don't really mean all these ideas are stupid, that's just how I phrase it when i'm being bitter =P)
So, while they are good for what they are, I don't feel they capture "the origonal spirit" of the settings (see the "too many cooks" thread).
For instance - Darksun never had (in any of the products that I personally recall): Aarakocra or Pterran being playable races, no "Brute" class, no "Psychic Warrior" et cetera. Now, I didn't have the 2nd boxed set, or several supplements... but unless I missed something big there it seems like these things, while okay ideas, simply aren't true to the origonal.
Also, this is certainly not to say that I could do any better, because I probably couldn't or wouldn't.
So like I said, I doubt I could do better, I could be mistaken and all these things appeared in the few supplements I didn't have (in which case, they should be in converted suplements, not converted core setting, IMO), and so on, but it changes the flavor of the world. It seems like these projects always end up trying to be more than just conversions, I don't like that. A conversion project should limit itself to converting, and that's it, IM(not so humble)O.
/endRantyPetPeeveIssue ;P