In recent times, it hasn't mattered a lot and you were good as long as you could write the code that people asked you to. However, the market looks like it might be changing with hiring freezes/slowdowns and layoffs here and there. If we do hit another recession, where we have to compete for jobs, the rules change. Anything that you do from certifications to MCS and any other way to set yourself apart from the crowd will be a benefit. I always felt like the MCS was beneficial because, unlike the bachelors, you're concentrating nearly exclusively on computer science, which is pretty cool.