Question:
What are the main strengths and chief limitations of datagloves and footmice?

Never heard of any of them, what are they?

These are input devices. You can Google them for their images as well.

I've looked at both and theyare interesting but to tell you what their limitatiions are I don'tknow!

The obvious limitations here is the complete lack of potential user awareness.
If you are attempting to market a new form of input control then getting them reviewed and asset would be a great place to start.