The idea of circulating a demo unit to the users of PFM is something we would certainly be open to. This is something new to us and would be really grateful if the wonderful users here could shed some further light on how it usually works (we just need a way of tracking the unit's movements)?
I've done this a fair bit with luthier made guitars over the years - termed a "Road Trip".
As noted above, you start a forum thread asking who'd be interested in participating and those who are then post their intent and where they reside.
You then workout the most efficient route for the unit to get from you, around the group, and ultimately back to you.
Each recipient keeps the unit for a week or two, and is then responsible for getting it to the next on the list (including the cost of that, be it postage or face-to-face handover) etc.
Insurance for the unit itself has been a sticking point in previous roadtrips I've partcipated in, almost always resolved by the manufacturer accepting responsibility for that. That usually means they take-it-on-the-chin if the unit gets lost or broken - I've never participated in a trip (or indeed heard of one) where that has happened in reality.
After having had the unit, the recipients then usually post their "review" in the respective thread.
Don't worry - they're almost always glowing...