Vantaggi
Working at Glyph was a very good experience for me: as a fully remote employee, I was very pleasantly surprised by the strong relationships I built with the rest of the project management team. There are no weak links in this company; the leadership is strong, things are moving in the right direction, the head of HR is a really compassionate guy (how rare is that?!), the senior team are seriously impressive, and the work is varied and interesting. It's a pretty small company but they will do their best to accommodate you in terms of benefits: the benefits are great considering the company's size.
Most importantly, any PM who starts there will be able to hit the ground running, as they have a very effective, simple and well-established system of tracking and managing all their projects.
I would strongly recommend Glyph as both an employer for PMs starting out on the vendor side of the industry, or for PMs who want to switch vendors. I will miss them all!
Svantaggi
It won't be great for you if you don't like high expectations. Glyph's aim is to differentiate itself from its competitors on quality, and they are committed to that. You can't goof off!
Also, for the moment, no matter where you are in the US, it works best if you stick to Pacific hours. That might be logistically awkward for some people.