Pros
With a little over 100 employees in Victoria, AbeBooks feels like a small company. It's possible to know everyone in the office, and social events still involve the whole group. While Amazon does own AbeBooks, and there is clear influence on its culture, AbeBooks remains unique. In addition, having the backing of Amazon means that you have ready access to amazing amounts of talent, resources and ideas. Participating in weekly video-broadcasts with Principal engineers from Kindle, AWS, Machine-Learning, Security and all the other teams is an incredible benefit to help developers stay current. I've worked at multiple startups (both pre- and post-IPO) and AbeBooks has the best blend of startup and established culture I've seen.
Cons
On occasion, the relationship with Amazon can create legal and policy requirements that slow things down a bit. The open floor-plan of the office can be distracting. I think I am getting fat from donut-days.