Pros
If you were there in the 80's & 90's and still there now, it's probably a fantastic place to wait out for your subsidised pension to kick in...
Cons
As a technology it is unsellable to new customers. Complex tools, specialist skills, long deployment cycles (8weeks for a cloud offering...!), archaic t&c's and legal engagement. Lack of flexibility in new opportunities - Unless a new opportunity looks, smells and tastes exactly like something that they have done before and been successful, the business packs up and walks away leaving sales high and dry. Remarkably sales management are actually blaming the sales people for leaving rather than looking at their own lack of ability and self preservation. It's just a waiting game till the leave themselves or get fired for lack of results or impact.