I've dealt with Andrew a few times over the phone. He has always called back (even at 10pm AEST).
I'm one of the people who purchased multiple devices through Payonix AND received re-imbursement via the affiliate system they have in place (yes, credit back to my BTC wallet - WITH confirmations).
I find it hard to believe that scammers would go to so much effort, including offering credit back to those people signing others up.
That being said.. myself and my two investors would very much like to see some specifications of the hardware.

I'd suggest those people who are unsure of them to call them, or visit them. Speak to them over the phone or in person and make your own judgement.
Until I have some valid proof to prove me otherwise, I'm saying they're a genuine business (without much business experience).
I've been there and done that, so I know what's involved.