If discussion on downloading music/movies/ebook from bittorrent and installing jailbroken apps is forbidden in LYN,
I think KO transformers should not be discussed here too. Some TF forums has special thread for KO discussion, but more on how to spot the difference, not comparing the quality good or bad / worth to buy or not, essentially it's "should not buy" instead of questioning "worth to buy or not"
For whatever reason to buy a KO stuffs, no matter the quality is good or bad, KO is still copyright infringement.
Third parties... well it's part of TF world now, yet looking at definition of KO from urban dictionary, they simply doesn't meet the criteria to be marked as KO
An item that looks exactly like an original product but lacks the expensive designer label and is replaced with a fake one. Usually costs half the price with half the style appeal. My only KO on the shelf, FPJ City Commander, well the pot calls the kettle black.
Yeah why all ROTF vanished from the market all of a sudden. I want a DOTM Megatron so badly!

P/s but in case u wanna know the copycat got various quality to choose...