I think it's both groups. A clone system rolling over the $100 mark is distasteful to a good many people as in the end, it's still a knockoff, even if it has perks since it just a ROM dumping emulator. Then yes those who have the preorders being dishonored or are friends of those who are in that boat are rightfully pissed off.
The thing is in this case Hyperkin should have NEVER done a preorder for a cash amount let alone put one out there as that would have put no gas to the fire other than the damned delays which also would have been cured not throwing dates around ignorantly. People can bitch and moan, but they're not entitled to a date or price until it's really really in the box and in their hands ready to ship out to distributors. Furthermore, they brought this shit also on themselves with the $40 price increase putting a design mod to it for a lame tray and molding to fit a SMS power base converter which was entirely unnecessary, maybe they did make the OS more complex or it's an excuse and most will never know.
In the end they did it to themselves and with those informed online they'll cancel, buy one when the price drops or used ones hit the market, or just eat it anyway.