Right now, they have all the features which are included in my validation test. 

User interface is pretty easy to use.

It gives you the capability to increase the Tap levels and voltage strength more than what you have in your signal.

The user interface is quite good. It is straightforward. It's not confusing. You can figure out the notes yourself without much help.

With the VNA I can set its parameters, so the tool is very flexible.

The Pulse Pattern Generator (PPG) and Error Detector are co-located, which makes it easier to use because I can just probe it directly on the PCB.

The most valuable feature is its frequency range.

The user interface is easy, simple, and practical.

It supports the PAM-4 encoding scheme. We use that to do our PAM-4 receiver validation. 

It's also quick and easy to use.