Corsair DDS VFO Mod - Replace PTO

WB8YQJ's beautiful DDS converted Corsair II, described on his Web site
He used N4YG's DDS kit

pto_parts_tn.jpg dds1.jpg
G3TXQ's DDS VFO, described on his Web site another implementation of G3TXQ DDS VFO

I have concerns over transmit spurs in the output of DDS VFO-equipped Corsairs.

Update: N4YG has discontinued the sale of the DDS VFO kit.