Echoing what everyone else said here, the K1 Glow is incredibly flippy. My specific disc is 173g with  the Moomin stamp. I thought I was insane before reading the other comments here, it seems this plastic just doesn't jive with this disc.

I bag a Halo Star Mamba that is significantly less flippy than this disc in glow plastic. It burns over so quickly, it's difficult to classify it as a distance driver. If you downtempo this and throw it more like a fairway driver, it may be usable, but you won't get distance driver distacnes you're looknig for.

Only issue I have with the Grym is that you can end up tuning this disc on accident if you hit something or fidget with discs. The plastic Kastaplast uses is top notch but in the case of the Grym and Grym X they hold an evenly bent shape very easily. As long as you're aware of whether or not the disc is as flat as it should be after hitting something it will fly well but if you hit a tree pretty hard or find yourself bending it out of habit you should definitely check it before throwing or it will just end up being way too flippy most of the time

I got this disc hoping it could be a workhorse driver on glow rounds but instead it is unusably flippy. My first throw with it was released with a bit of hyzer but it turned and burned immediately. I then threw it on an almost vertical hyzer and it still flipped past flat and went right. I guess I can try using it as a roller but that's not at all what I'm looking for. Guess I'm still looking for a workhorse glow driver!

This is a strange disc because I do bag it. The rim depth is maybe a touch too shallow to feel super comfortable. The flight numbers are very wrong too. It is so much more understable than stated and it doesn't glide very well either.  My glow K1 is also even more understable than the regular K1 plastic. I use it as a utility understable disc, but I don't think it is workable as a main distance driver.