I cannot say enough good things about HubSpot - I drink the kool-aid and I am proud of it.
Pros
As an Inbound Marketing Specialist, I appreciate the clear standards and structure within our sales organization. I know exactly what is expected of me, and in return I understand exactly what I need to do to get to the next level. I have worked in a number of quota bearing sales roles in the past; it is a breathe of fresh air to be part of the HubSpot sales team. I feel like not only am I contributing, but also my colleagues around me, they are contributing. Everyone works hard. Personally, this is an extremely motivating work environment - to know that "I'm not the only one" giving it 110%.
Cons
While it is great to promote from within, I wish there was more clarity & visibility into internal promotions - understanding the root cause for these promotions - more than just the normal highlights, a couple examples & top accomplishments of an individual, but the real "why" behind the promotion. I think more transparency around internal promotions would soften rumors of 'favoritism' and 'promotions based on who you know, who likes you'.
