Pros
Working at Sherwin-Willams HQ, job security is excellent overall. They are also fairly flexible with schedules and provide reimbursement for certifications and college coursework - both of which are often important to young professionals as well as managers looking to advance thru MBA programs. On the business side, the culture is very lean and efficient, while on the IT side things are run much like a mom and pop shop at times - this allows a lot of freedom and leeway in how you accomplish goals and learn new things. People are generally warm and open to answering questions and sharing their knowledge.
Kontras
Sherwin-Williams is an old fashioned manufacturing company. They are an enormous global enterprise. With those things naturally comes baggage like bureaucracy and resistance to change - a lot of processes are in place to provide organization and control. Though these often help in providing a consistent environment across the enterprise, they also often hinder new exciting benefits and getting seemingly simple tasks pushed through the system. You won't find the flexibility or total freedom you find working for smaller employers. In summary, they are somewhat monolithic in their standards and old-fashioned in their procedures - you will need to be able to work within these corporate traits in order to successfully move things forward and impact change in the enterprise in the future.