I've been very intrigued by this product for a while now. Maybe it's not true, but I thought typing on a platen without paper will damage it, so I guess it's alright for a machine that you're not worried about or one that already has a ruined platen. 

Then I also wondered if there would be any effect on the tablet from the vibration created by a typewriter.

I can't wait to read about your impressions of this system once you've been using it for a while. How difficult was it to install? Would you recommend it? Is it practical, or just a novelty? 

In two minds here.  I love the fact that someone has carried the idea through to reality, but wonder about the real range of applications.  Basically my view is; if you like it, why not.  Had I far more spare cash than I do, I'd probably set one up just to see the effect.

One practical use would be in the teaching of touch typing on manual machines, rigged to a computer program designed to teach it.  Any one following through on this a making a fortune might remember where the iddea came from! - just kidding.

I believe I've seen 'Steampunk' keyboards so rigged.