Ventajas
You will encounter some nice colleagues
Desventajas
In my location at least, workloads were generally high (and increasing), while salaries were low (and barely increasing at all) and did not meet industry or country standards. Levels of stress are high, with several employees suffering from burnout, anxiety, etc and some even quitting. Very little effort was made for employee retention, at least in my location. For example, if you were in Western Europe, it was much harder to get any career advancement or salary increases. Most opportunities and promotions went to employees in Eastern Europe (e.g. Czech Republic office), even in cases when they were less experienced/qualified and had a lesser knowledge of the clients, requirements, etc.