You have a chance to work with smart people on a cool product. Cool brand name. Great benefits and really good work-life balance. Pay is good as well.
Cons
Career opportunities in the Estonian office are limited. MS has introduced several layers or bureaucracy since it acquired Skype a few years ago. The base of innovation has slowed down.
Technologically challenging and amusing, independent work plan & schedule, very good remuneration. Working schedule is extremely flexible—you can more or less work where and when you want as long as you deliver. The office has 24h free food which saves a lot of time. The social part of working at Skype is quite developed—team/company dinners/parties regularly. The company is also growing rapidly so there's no shortage of new stuff flowing in.
Cons
Not enough attention seems to have been paid to code/product/process/methodology quality in the beginning/recent years, albeit that is rapidly changing with a strong shift towards high standards and skill enhancement. The somewhat rapid growth rate can cause slight anxiety and restlessness.