FWIW, I have experience with the LeoNTP, TM1000A and TM2000A.

The LeoNTP is a very solid NTP server. Highly consistent service, with 
extraordinary low variance assuming the display is left on the default time 
screen (other screens negatively impact variance). Standard deviation reported 
by Chrony using hardware timestamps is in the low 10s of nanoseconds.

My TM1000A unfortunately died a couple of years ago. I remember it as a fairly 
consistent NTP server, with standard deviation in the mid 10s of microseconds.

The TM2000As I have are of an older vintage. As a PTP server, these units 
functioned okay. However as an NTP server, they were really not great. Lots of 
variance for NTP, and occasionally would wander off by several seconds. I note 
that there is newer firmware which may address some of the NTP issues, however 
my hardware appears to be too old to update to the current version so I cannot 
confirm.

I do not have any experience with the TM2000B.

Your mileage may vary.
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