Pros
Opportunity and freedom - As it is a very fast growing company, you quickly have to become good as you will be tomorrow's leader or 'experienced' team member, where tomorrow is literally within 8-10 months. With this comes huge opportunity (if you want it) to develop and learn. As the company needs to change regularly because of it's ever changing size you become the process creators of the future. Management tend to trust the people they promote will do a good job of creating the future of the company.
Cons
Qualtrics is a hard place to work. The company re-invents itself every 18months and requires you to evolve with it. This can be a strain if you want to have a comfortable job that requires you to do a similar thing day in, day out. Because it is hard work, it can be easy to feel you are not being paid enough at the beginning. This is a fallacy in my opinion. Also, pay gets considerably better with promotion.