The older metal flake teebirds(I believe 2015 and before) are much more stable than normal stock run champion teebirds. It's basically a teebird flight with the ability to handle headwinds like a firebird. They are absolute money. They take FOREVER to beat in and then stay in the sweet spot for a really long time. Needless to say, that's the only teebirds I throw.
From what I've heard, the newer metal flakes are straighter than normal stock runs, but I have no personal experience with the newer ones.
I cannot speak for the color glows.
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So I got really interested in finding the differences between Metal Flake Teebird's a few months ago since I was looking to find a replacement for a 170g I had been throwing heavily for a few years and is now a dead straight flyer. From what I can tell there are 3 different types of MF Teebirds...
1 - Slightly gummy ones with tiny flakes, the two I have like this are from 2012 which I believe are first runs since MF started to appear in late 2011. I don't know if all of them from that time are gummy, just the two I have are. I started throwing one of them recently and it its got some nice glide to it with a good finish.
2 - Stiffer run with a ton of tiny flakes. The one's I have found are stamped from 2014 so I consider them second runs. Out of the 5 I have, 3 are board flat, and 2 have a mild dome to them. I have yet to throw the ones with dome's but the board flat ones are extremely beefy, as much as the Brinster's if not more.
3 - Stiff with less flakes of a larger size. They're more recent and the type of flakes you will see in any of the newer MF runs out there and I just group them together as 3rd runs. They just seem to fly like a standard Teebird to me.