Pros
HubSpot is a dynamic company in a fast-growing technology segment. The company never sits still and you can sense that the excitement through the constant new products and features being launched. And the management never flinches from making bold decisions that has a major impact on the entire company. One of the great perks in working in HubSpot is that you are surrounded by some of the smartest people in the industry. More importantly, because of the transparency in the company (particularly through the internal wiki), you can understand the thoughts and debates behind many important decisions made in the company. That makes it for a great learning experience if you are willing to invest your time and energy. On the sales team, there is a strong structure and data-driven process around it. I feel HubSpot is a great place for a salesperson to start their career (especially if they want to build a career in tech sales) as they learn so much, not just learning from more senior colleagues, but also from learning the process.
Cons
The constant changes, while mostly positive and much needed for the company as a whole, can take its toll on individuals. On the sales side of things, the changes can impact your ability to do your job but you still need to hit your quota so there is a lot of adapting needed. It's probably not so much a con but a challenge that comes with working for a company like HubSpot.