Pros
I am a Millennial, and Vertex is my first "adult" job out of college. At the time of writing this, I have been at Vertex for 5.5 years. I love Vertex! This company really treats its employees like family. At Vertex, you are not just a number, but someone with a life outside of work, and it's fantastic that the company recognizes that. Many people stay at Vertex for 15, 20, 25 years, and I can certainly understand why. When people ask me if I like my job, my answer is almost always "No job will ever be perfect, but Vertex is pretty high up there!" The people, culture, and total rewards make this house a home, and I'm certainly blessed to call Vertex "home".
Cons
This may only be a "con" to some people, but I thought it couldn't hurt to point it out. Vertex's culture always seems to be in a constant state of change. I love it, and am able to easily adapt to the change, but I'm sure there are some people out there that may find it as a little bit of a belly ache. It depends on the individual to be adaptable!