What are an engineer's most common concerns when selecting instrumentation?

Hi everyone, I'm Jacob Cheng from China, working in an electronic instrument manufacturer, and this is not a promotion content, I'm here asking for help.
As a freshman of marketing promotion in the electronic instrument, I have no idea about what topic will engineers interested in. So, I'm here today to ask for a little favor from an expert like you guys, sincerely.
We manufacturing digital DC power supply, frequency converter, all kind of power testing equipment the most. For example, the frequency converter, use to simulate power network for product testing. Then you wanna know about this machine, what you want to ask? Here is some of my thinking:
What's the feature of this machine? (compare with general model）
Compare with XXX brand, what' the result?
What's the power core? What's the capability between different core?
What material made of? That decided how long I could use it.
Anything else comes up?
I know I maybe ask a stupid question, but I really need help, please leave your comment, thank you, guys.

Hi,

Maybe:

What degree of post-sale technical support is provided?

Are tutorials and implementation notes and tips available?

How seamlessly or torturously (and slow) are repairs dealt with? In-house or by approved local subsidiaries/partners?

If for production use, can it be calibrated and certified so?

How reliable is it? How tolerant of abuse? How available are
spare parts and can it be repaired at all, better yet with
in-house technicians?

How is integration support? Labview VI available? Other
simple useful interface to test platforms?

That is a little complicated, but we will try hard to improved this.