Pros
Dell is the first employer I have stayed with more than a year. I first joined Dell as an entry level sales person to get a good company on my resume. Dell rewards hard work and dedication - with both pay incentives and career opportunities. The personal development I've had from Dell has been amazing. They try to keep the environment at work fun a fun place. The benefits are also amazing, the pay is more than competitive, and the environment is challenging. This is not the place to be if you want to coast and just get a paycheck, but it is the place to be if you want to work hard and get the most out of everything you do. The people that work at Dell have been the most open and compassionate people I have come across in any working environment. Dell (and its people) encourages you to be who you are, not just a corporate clone.
Cons
Dell is very results focused. It's fast paced and ever changing. You can't do one thing well only once, and expect to coast the rest of your career. You have to consistently perform well. Things change on a dime. I have worked for Dell for 5 years (both in Nashville, TN and in Round Rock, Tx) and the longest span of time that I have had the same manager was 12 months. When I was in sales, I consistently worked 60 hour work weeks. Dell is not a job you can leave at work, either. It permeates every part of your life. You find yourself talking about work with friends and family outside of work, and they have no idea what you are talking about. When two Dell people talk about work with others, I've been told it's like we speak a completely different language.