Pros
There are plenty of opportunities at Fiserv and will be for some time to come as the company continues down the 2.0 path. Fiserv is a large company and is now having to act like one. Once you are an employee, it is not likely you will ever be let go, so long as you do a "decent" job.
Kontras
Fiserv is not the same company it once was. Health care benefits continue to decline. Sabatical program is long gone. Checkfree is fast becoming the lead organization. To work there you need to be able to handle a great deal of continued change for the next few years. People desparately trying to hold on to jobs/departments/empires make it very hard to take care of customers and prospects. The client no longer comes first and people no longer make the difference.