Still paying 5+ times the price for budget level hardware isn't exactly sensible.
While you can get Sound BlasterX AE-5 with pretty much absolute top level D/A-converter and high end headphone output (+ lots of other connectivity) for clearly less than GSX.
And for less work in installation (or no space inside case) Sound BlasterX G5 would be pretty comparable to AE-5 at same price.
Realiser's BoM certainly wouldn't look "nice" for buyer.
Lets hope that in some day there's measurement standard for personal HRTF, which you could get measured in say shop and could then use that measurement result for adjusting devices and sound cards.
SB is coming with a Realiser like product as well. I wonder how it will compare.
Will take a look at that G5, thanks.