Pros: excellent work environment.
Cons: on a busy day it can feel a bit like a sweatshop, limited opportunities for gaining skills outside support.
Overall VMware is an excellent employer, with great work environment. For the most part it's well managed. It's an interesting place to learn about virtualization and how a datacenter is managed. Maybe not so much for someone with a lot of hands-on experience or who wants to work directly with provisioning IT services to end users.