Prós
Leading innovator in local search SaaS space with great culture and ability to grow. Being in this company for 3+ years I have personally felt that my contributions would be added to product strategy and involved in customer requirements. My concerns or comments are always taken into consideration and I feel that i have value in the company as it operates. You could take a job in a big company and see the same tasks over and over without any client benefit, whereas Rio SEO leads in taking customer feedback and emerging technology to succeed.
Contras
Start-up so requires self-motivation and personal drive to make a difference in emerging technologies. This is a standard for start ups and has the upside of being part of something influential rather than logging hours in a never ending task-based job.