Ventajas
Pretty much unlimited upside. Performance based culture, if you perform, you will be rewarded. Ability to work across the business and take on challenges outside of your usual wheelhouse. As a late-stage start up, lots of opportunities to come across gaps in the business and work on fixing them . Least micro-managed environment I've ever worked at out of 5 start-ups here in Austin. Leadership trusts you to do your job without being over your shoulder. That may be a challenge for some, but if you're self directed and have a passion for working hard, you'll do well here.
Desventajas
Things move fast and if you're not used to - or don't like - a lot of change, this may not be the place for you. Personally love the pivots as it opens up new opps that weren't there previously.