Pros
Benefits, collaborative environment, freedom to work outside strict boundaries (at least in Research), flexible working hours, great transportation options, friendly and engaged employees, products impact consumers' lives in a profound and beneficial way.
Cons
Now considered "Big Pharma" due to the Roche ownership. This translates into more rules, slower processes, cumbersome information technology systems (SAP-based), less individual impact on the company's successes (and failures), and a more "9-5" mentality of the workforce versus before when employees would go the extra mile to take things to the next level. Career options can be extremely limited without advanced degrees despite solid performance. Performance is only very loosely tied to compensation (i.e. you can bust your butt but only receive a modest increase in salary [about +2% relative to average increase] and bonus [about +20% relative to average bonus].