For me it's still a thing to do with my V5 board. In Europe it's not easy to catch wwv broadcast stations. So with wspr reports I was able to see frequencies of reporters and it seems that I'm just about 50hz drifted so I guess it's quite good indeed. 

The difficult part is the BFO adjustment. We don't really know the values you change. I can now understand voices but I can't say if it's on the right frequency. 

Need to make some improvements in my wiring first and I'll check again. 
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73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA