I just purchased a Mares Dragon yesterday from my local LDS, and admit I didn't think to consult SB re any issues before doing so. I was astonished to read in the enclosed manual that the BCD was not usable with Nitrox out of box, and was ready to return it for another manufacturer's product over this very issue.
The last entry in this thread was dated 03Apr07. Here it is mid October 2007, and the online manuals STILL say that a) not only do you need a conversion kit for use with Nitrox, you also b) need to have the BCD serviced by an authorized technician if subsequently used with regular compressed air.
If as several company representatives have hinted, but have not EXPRESSLY STATED that the BCD can be used with Nitrox mixes up to 40% out of box, why hasn't your online information been updated yet?