Benefits are plentiful and generous, though they have declined since Wells fargo's acquisition of Wachovia. Still, WF offers some of the best benefits I've seen in a large corporation. Job opportunities are plentiful in this international company, especially in technology, where initial-hire salaries are very competitive.
Cons
In-house promotions result in small wage increases. To earn what you're worth after several years experience, you'll have to look elsewhere. Being the huge corporation that it is, the scope of most technology jobs is very small. Most developers, for instance, will spend all their time doing one thing and will have very little opportunity to explore new technologies.