Be aware that, unless you purchase from an authorized distributor you will have no warranty or after sales support.
Personally, I'd go for a Delta Sigma based DAC from a leading manufacturer. With the use of up-sampling, post DAC processing and other digital manipulation DAC conversion using Delta Sigma chips has been refined to a point where R2R DAC's are somewhat niche for those who like to play around with rather expensive gadgets.
Your other gear is going to make a whole lot more difference to the overall sound that reaches your ears.
Studio grade A/D D/A converters are not R2R and they are mastering grade and cost many thousands of $'s.