Pros
The Esri community is very close and most employees are open to helping you in your job. Access to current software and training for employees is excellent. Atmosphere is relaxed and very conducive to learning. If you are a technical GIS person it is a dream to work here.The relationship with customers is very special in this company. Esri cares about it's customers and is not just out for the money. The vision of our CEO is very refreshing, job security is excellent and Esri is a very stable company. Benefits are about average not too bad and not too good either. Overall Esri is a great place to work but just like every company there are some downsides.
Cons
Definitely do not work here if you are looking to make money. Raises are low and the review process is very tedious. Good performance in your job does not necessarily translate into more money. Management can be hit or miss. At the top it is typically good, but middle management can sometimes be very unreliable and out of touch. There is also sometimes a palpable tension that develops between technical and non technical folks. Especially on the sales side. Career mobility is an issue as well. To change departments within Esri, even if you are very qualified and have manager approval, can be harder than an act of congress to get done. Promotions are rare, Esri will say they are a "flat" organization, but in reality they are just like any other company with a hierarchy of employees. Esri can also be very "cheap". This is good in that they are conservative but sometimes it comes across as being indifferent to the employees. Employees are regularly asked to share hotel rooms on business trips with other employees and expenses are overly scrutinized.