Never regretted quitting either. My first job was pretty stellar too, in engineering R&D, and probably the smartest set of people I've worked with to date. I must have been among the top earning graduates from the CS program at my university (which isn't a great university for CS, to be fair). I quit because I couldn't adjust to being a company employee, working in a bland business park on the edge of a new city, writing Python in an open-plan, doing agile, and going to lunch with the same people at the same time every day. Great company, feel nauseous just thinking about it.