Here's another way to look at the DOT050V based GPSDO: Time deviation.

This graph shows the deviation (relative to an OH300 based GPSDO) in time of one of the DOT050V based GPSDOs I've built.

What this graph effectively means is that if you built a clock from both of them, the two clocks would be within 70 ns of each other after 1000 seconds, and would stay that way at least out to ~15000 seconds.