Pros
Bloomberg really takes care of its employees. The management is painfully nice and polite, and the pay is very generous for the work they have us do.
Cons
The biggest challenge for me was that the work was just so boring. The technologies used are ancient, and honestly, I hate the terminal. I did not appreciate having to use the terminal to get even the most simple tasks done. There's a culture of building everything in-house, and this is NOT a good thing. There are fantastic databases and email clients out there, but Bloomberg employees are instead stuck using some guy's afterthought side project instead of those functional outside products. It's a serious drain on productivity. Also, the process to move code to beta and production is extremely draconian and micro-managed. In any other company, I could accomplish in two weeks what it took me two months to do at Bloomberg. If you envision yourself having a "cushy" job and being a "lifer" and loving that lifestyle, you'll love Bloomberg. If you feel even a modicum of passion for your work (as a developer), you might want to think twice.