Pros
IBM was a great place to work because of all the information sharing and availability of all employees through out the company. I was amazed to find out that almost 40% of IBM's software developers work remotely. This being said IBM makes all employees available to everyone for questioning. Don't know Perl? There is an IBM community dedicated to learning Perl where professionals share their opinions. This also follows for many other technologies.
Cons
Since I was just a co-op the project was a "nice to have" feature on a main product line. While the work was challenging, engaging, and fun, I couldn't help but feel that this might not make it into a release. And if it was to be released it wasn't going to be for a long while and they'll probably just have to re-write it since a lot of the product will have changed since then.