Pros
I was in the central analytical group, which was eventually folded into Specialty Catalysts & Process Technologies. Pleasant and collegial work environment. Nice campus with an on-site gym, decent (sometimes good!) cafeteria, a colorful history (there's a good/hilarious reason they all drink bottled water), on-site doctor and nurse (free!). Depending on your manager and work, it's possible to have flexible work hours (45-50 hr weeks were typical in R&D). I usually did a 10-7 schedule. Everyone was generally accessible and happy to share their (overflowing) knowledge with you. A self-contained powerhouse of expertise in polymerization catalysis and processes. It's really possible to create as much of a role for yourself as you wish. Building rapport with lead scientists pays dividends.
Cons
Understaffed R&D team. "Lean" teams meant we were always responding to crises. Investigations were not recorded or documented in a coherent or accessible way, and familiar problems would resurface periodically. I'm not sure what the current situation is.