Ventajas
thoughtbot is a very humble and kind company, very focused on helping everyone to improve while maintaining a stable business. It's consulting, but only 4 days a week are used for client work, one day a week is set aside for investment in self (e.g. learning), community (blog posts, conference prep) or company (e.g. interviewing, admin etc). Good variety of work all over the world. 100% remote, forever.
Desventajas
By far the biggest con is the salary; I regularly receive job adverts with 30-40% higher salary. Management has (probably correctly) recognised that current high tech salaries are fuelled by VC hype rather than real profits. Still, it is sometimes difficult to see the industry's inflated money and titles pass me by.