Pros
Really motivated people from my experience, majority are passionate and nice. Good work to life balance, two home work days and three office. Solid salary and benefits, not getting rich unless high up, but nice benefits with vacation, free coffee, inexpensive lunches, good product discounts if you're a Lego fan. If you're manager's cool, it can be a fun place to work.
Cons
Billund is not for everybody, It's a tiny company town in the middle of nowhere without a direct train connection from Copenhagen, which is unusual for Denmark considering Lego is one of its top employers.