I have one of these units and it is useful. However, I have the following criticisms:
1. While jitter performance is excellent, harmonic distortion is significant. Use of an external filter is often required (in my applications).
2. EraSynth uses a non-standard programming API. I would have preferred the programming API be based on SCPI. With the current firmware, the unit cannot be conveniently detected and controlled like (most) other standard test equipment using the National or Keysight VISA libraries.