Critical Opinions needed: Guitar Learning Aids

Hey Guys,

I am studying design engineering and doing a project that involves designing a guitar aid at university and was wondering if I could have your opinions. I know nothing beats practicing with an actual guitar, but what about when your out of reach of it, in the class, office or travelling?

Anyway I have purchased numerous hand exercisers such as the Gripmaster and also a Shredneck Guitar, and was wondering if I could have your opinion on those. I have my own but yours is more important to me. Comments appreciated below

and if you have the time doing the survey I made below will help to.

I have made a 3 minute survey, so if you're interested in helping it would be great!

https://adobeformscentral.com/?f=32jl2cfOdx8W-F43Bi3lgw

Thanks