OK, I just received my purchase, the shipping was fast, you can see it took 11 days from saying I want one to it arriving!
I ordered the 50 euro board. I wanted a separate voltage reference to compare my recently repaired Fluke 3330B and my Keysight 34461A against.
However, between ordering this board and it arriving I actually upgraded from a 34461A to a DMM7510
This means i can do some serious testing of this reference.
I warmed up the DMM7510 for 90 mins and performed an ACAL. I then plugged the board into my bench PSU, first removing it from its anti-static bag, but returning it to its foam padding to reduce air currents and started logging! 5 NPLC and moving average of 20 points as recommended by the meter for maximum precision.
On startup there's a rapid transient followed by a slow drift upwards over time, but the voltage is accurate to 10ppm, which is quite impressive given its just been posted, ripped open and popped on.
Roadrunner, can you comment if you age these references at all? I'm going to leave it connected to my meter for a day or two and see what the performance is like over a longer time and will post again!