Filled it!
I understand your experiment is already under way, so it is unlikely that you’d be able to change your methodologies at this point. One small feedback on the questions, however. As presented (to me, maybe the system is randomized, I don’t know) the questions felt leaning towards difficult/complex to use, which may lead the user skewing their responses negatively. While this may be counterweighted by the fact that you’re asking a niche community using these systems already to complete the survey, it may still be a good idea to ask more neutral questions and allowing the users to select from a spectrum instead.
For example; instead of “I find the system unnecessarily complex; Strongly Disagree… Strongly Agree”, it may potentially be better to ask “How do you find the system? Very Straightforward … Very Complex”. Your score for each of the selection would be consistent (1 is less complex while 5 is more complex), but you’re not impressing a negative sentiment on the user.
Anyway, good luck with your study! Looking forward to your published results!