I have DMT diamond stone that are over 30 years old and working fine.
Light pressure and lub with mineral oil.
One XXC I did trash with attempt to flatten a bottom on old Stanley wood working plane, the soft cast iron and too much pressure (impatient) did tear out the diamonds from the nickel plating. The XXC is still working however, rather poorly.
Hardened steel and proper pressure, let the diamonds to the work and they will last for many years.
The early posts referring to Edge Pro are most likely from excessive pressure and/or poor quality imported diamond hones.
Regards,
FK