Long time reader, first time caller.
I picked up a first run Glyph in each of the two plastics.
I've thrown them each a few times already.
About me, I am pretty new to disc golf. I mostly throw backhand. I like the Polecat but my release is pretty awful so I have to throw them like a hyzer flip to get them to fly flat about 150-200'.
If a Polecat and a Berg made a baby in your bag, you'd get the Glyph. It flies dead straight. It's probably my straightest flying disc in my bag. I throw it a little nose up just go get it in the air and down the fairway. When it stalls out, it just falls straight to the ground with zero fade. It just drops out of the sky like a brick.
I feel like it's easier to throw than a Polecat or a Glitch.
I've haven't thrown it side by side with my Polecat yet. I feel like it will fly like the Polecat but won't have the slight fade at the end.
If I throw it on hyzer gently, it will holds its line. I left my putter at home one day and used the R Blend Glyph to put and worked quite well for hyzer putting.
As for what the disc is, I've heard Rhyno, Pig or Birdie top with a Polecat bottom. Polecat bottom I can agree putting them side by side. I put the Glyph side by side to a Pig and a Rhyno and both are too rounded where it comes up to the thumbtrac. I have never held or thrown a Birdie in either of its iterations. My guess, it's a Thumbtrac Birdie top with a Polecat bottom. I've also heard it's just a Thumbtrac Birdie.