Pros
I worked for Tyco just short of 10 yrs. during that time, there was A LOT of change! In 2007 Tyco split into 3 separate companies. 2010 ADT/Tyco bought its largest competitor. 2011/12, Tyco sold off the Residental arm of ADT. 2012 announced the consolidation of 4 of its remaining companies to the corporate level. 2013 moved the corporate HQ from Princeton, NJ to Switzerland. 2014 moved the corporate HQ from Switzerland to Ireland. Luckily I was able to work on all of those projects and build a solid resume. But it wasn't easy by any means.
Cons
There is no such thing as work life balance if you are above an analyst. People are always in fear of layoffs. I would be up on conference calls at 6am. In the office by 9, leave at 6, count the minutes until my kids went to bed at 8 so I could rush to be back online working until at least 1 am with a lot of nights ending at 3 am and pulled "all nighters" at least 2 times a month. Everything is a fire drill. And for working on all of the special projects you receive no compensation at all and told that you're a lucky still to be employed.