MSB DAC LinkIII 24/192KHz

Has anybody upgraded. The kit is available at Sound4Sale for 539$ installed or 399$ DIY. It is installed in your player and requires that you have the Network Upgrade in your DAC (another 200$). I am wondering if it is worth it. How does it compare to the PS or Nelson Upgrade.
I have a Link II that I sent to Stan Warren in Oregon for modification. Well worth the $250+ or so I spent. The Chicago Audio Society uses a Stan MSB as one of their reference DACs.
I had a MSB Link DAC III modded by Dan Wright at for $250. It was well worth it. Either Stan's or Dan's mods may be better values.