Pros
PIMCO is a high performing and collaborative culture. The professionals here are among the very brightest in the industry and some of the nicest investment professionals I've had the pleasure of working with (20+ years in asset management). PIMCO is lean shop so employees have a high degree of responsibility and there is ample opportunity to take on additional projects to broaden one's experience. Being lean also provides opportunity to have one's work be visible (great for those who want visibility and to be recognized). There is a new CTO so there a healthy emphasis on technology. Growth in technology goes beyond quant and data science (every asset manager growing on these fronts) and includes technology infrastructure which is unique relative to PIMCOs competitors.
Cons
The downside of being lean can mean for some longer than normal hours. As long as one is aware of this it shouldn't be a problem but if one is expecting to be in at 9:00 and out a 5:00 he/she is going to be disappointed.