I know this topic has been covered before, but I've finally received an OG Sheep Micro 660 spool that feels completely different than the 330 or individual package. The label on the 660 is nearly identical to the 330 - as the TW caption states, they should be the same string. The playability, however, is quite different. The latest 660 reel plays very stiff, not like a synthetic gut, but more like a polyester. There is a lot of control, but very little feel and power which is what I like about the OG Sheep Micro in general. There is feedback in the 660 reel section that hits the nail on the head about the comparison to poly. IMO, TW should remove the statement about the string being the same as the OG Sheep Micro when it is clearly different.