Here is a quote from Xecuter
http://team-xecuter....ead.php?t=83008"Xecuter hasn't forgotten JTAG fans either, there are thousands upon thousands of users out there who run a perfectly functioning JTAG machine - many of them using the Xecuter JTAG QSB Install Kits that have become so popular over the last couple of years. Not only does the DemoN support all of the latest RGH devices such as the Xecuter CoolRunner - but we have also designed the DemoN to make sure that it doesn't affect any current JTAG installs - which is ideal for those who have the QSB kits installed and working perfectly - fitting the Demon does not require that they have to remove their functioning JTAG feature. The DemoN will also work with your currently installed RGH Device especially the TX CoolRunner and it's QSB install kits. Xecuter thinks of the customer experience first and foremost !"
Why would I put it in a jtag if I can't get on live. Are the other advantages to a dual nand?
Nevermind. Already answered over there. "If you want to go on Xbox Live with a dual nand then of course you would use the RGH method as SMC exploit is not required and you can get the same end results on all models of dash/kernel/bootloader regardless of which eFuses are blown."