Pros

established company: SPSS is reknowned for world class statistics software. It's a dream company for someone with great interest in stats to work for.
flexible work schedule: employees can work from home at least a day in a week
good benefits: SPSS has better medical, 401K, espp, etc. benefits than other similar companies
good stock: the stock price has been going up lately. It was a top priority of the company way back in 2004. The policy seems to be paying off.
talented coworkers: Chicago has many good universities, which is where SPSS gets its talent from. It's good to be in the company of smart people.
location: what's a better work location than chicago downtown? (but of course commute is an issue if you live in suburbs)

Cons

limited career growth: career growth in SPSS is very limited, and takes a long time to get promoted for about 95% employees. Only a chosen few climb the ladder faster. There are many people who have been in the company for 15+ years, which is good thing. But that's probably why career growth for fresh recruits is very slow.
low salary raises: this is somewhat tied to the above point. But year over year merit increases are very low, probably less than industry averages.
frequent layoffs: after the market crash in 2000, layoffs were as frequent as every quarter. Not a good ting for employee morale.

Advice to Senior Management

be better at employee management, provide opportunities to grow