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Iridient Developer simply uses Apples raw engine, like with Aperture, to support X-Trans. You'll get better detail than with ACR, although you do weird green/purple artifacts and speckle-y dots in some areas from time to time.
I don't quite get the draw of Iridient over Aperture, but I haven't spent any time really digging into Iridient. For me, Aperture has by far the best workflow of any system for shooting/organizing/de-mosaicing of any similar system-- except for C1 Pro when shooting tethered (MFDB).
As far as I'm concerned, Apple RAW is leaps and bounds better than anything else out there for XTrans at this point-- and that includes the in-camera JPG engine, which is quite good. For most shooting, the SOOC jpg and Adobe RAW funkiness isn't a big issue, but it's a bigger issue than the high-contrast speckles Apple RAW produces.
Aperture for 90% w/ NIK plugins for the remaining specific situations, particularly B&W and area adjustments of exposure/contrast (which is, frankly, brilliant in NIK... I wish Aperture did this without needing a plugin and kept the RAW alive) is a great combo.