I can't really even explain the feeling other than it just totally sucks to see your idea taken and not just having money made off it, but becoming a whole sub-segment of a market unto itself.
A few years ago I made a very simple DJ related device that I thought I'd share on a DJ specific forum. I was quite surprised to see the enthusiasm for it and was even told by one of the members that I should consider taking down the pictures as "who knows what vultures may lie". I gave it a quick thought and promptly heeded his advise. However, it was in vain as within a year suspiciously similar products started popping up on the internet.
Can I prove that my idea was stolen? No, but you can't convince me otherwise. I was naive at the time and only have myself to blame so I've since been much more selective with what I post about my inventions / ideas which really is a shame because it would be great to get feedback on them. So why not apply for a patent on them you may ask? 'Cause they're damn expensive to acquire and even more expensive to defend. There's an old quote I read somewhere that went "Your patent is only as good as your pockets are deep", and my pockets are unfortunately rather shallow lol .
With all that said though, I'm not sure where I stand on the original matter; there are good arguments made for both sides. All I know is official Arcadia products are well out of my range and if the KO's are reasonably priced, I may have to jump on one. Perhaps if Harmony Gold / Big West were a little less iron-fisted with their IP's, we'd be getting original Macross related / inspired designs ala 3rd party TF's instead of straight up knock offs.