Vantaggi
Dell pays well for the work that you do. Teamwork driven (if you are in a team division) and bonuses can be very lucrative if you over achieve your quota. However, be aware of the "Dell payback". If you are in a division where they pay you on a draw (in advance) and you do not hit your quota, you will have to pay dell back a portion of the money they gave you for the month, this amount can vary. If you are interviewing, ask about this and make sure you CLEARLY understand it.
Svantaggi
In sales, they are extremely quota driven and nothing else matters but hitting the number. Internal promotions are nothing more than lateral moves where you do the same job with different people in another cubical, with a different title, VAR, SMB, 08,05, etc.. If you come into sales, you are therefore forever stuck in sales, regardless of your degree (BA, BS, MBA, ETC.) or skills. If you love sales and never want to do anything else but sales, then go for it. Dell is the perfect place for you :).