Got my $5 Koss today.
They are what you might expect for $5. They come with very useable clear wide bore tips that are kinda firm. They will be worth keeping to try on other phones. Thin cable that is shiny and more plastic in feel. Close to the 3580 and CLR100 cable in appearance(very budget). Small straight plug and Y. The housing and strains are quite sturdy and nice. The fit is quite easy, very stable, comfy for me. The housings are pretty big and fill your ears and they don't seem to have vent holes so they isolate quite well.
They sound quite thick but in an enjoyable way. A nice size stage with the 13mm drivers and some room behind them in the housing and also the wide bore tips. The way that seems like burn-in will improve them. I'll see how they stack up to my CKP200 when they have enough hours on them. Not expecting much more than a good beater for the price.
At the $5 total cost the lifetime warranty is not in play since it costs more to replace them then just buying another if you happen to like them and wanted another pair.
Still a little fun to slum it in the ultra budget are once in a while and I may still try and mod them if possible. They won't turn out as good as the CLR100 but fun to try. Need to lay off my SA7 Ltd. for a while as well then get fresh ears on these Koss. My R3 also showed up, and while very beefy looking, they didn't survive the trip. May still get another pair if any more early production samples are left. Oh well.