A fellow TFF-er posted 'bought 600 yard spool of #16 Sunline FC Sniper for $35.". Box label had a couple of misspellings. He did the burn test and it failed. .
Nor do I. Made that mistake once. Got a spool of used mono instead of 14 lb sunline flouro.
I just received a 600 yd spool of mono ordered thru Amazon and the spool was less than half full. This was my first bad experience ordering line. In the future, I will buy fishing line in a store or tackle shop.