Vantaggi
Cisco is a leader across many different sub-industries within IT: routing, switching, storage, VoIP, wireless, optical, application acceleration, etc. which allows sales engineers to gain a wide breadth of knowledge and exposure across many different technologies and products. Working with Cisco is very fast paced and you get to play with cutting edge technology that has not been released to the mainstream public yet. Cisco sales managers do no micromanage; they give their employees all the freedom and resources needed to get their job done.
Svantaggi
If you don't love electronics or gadgets or computers, you will be lost. You have to love technology to succeed or you will be too overwhelmed. When working in sales where customer satisfaction is paramount, sometimes this means you have to make yourself available during non-standard working hours. Also, because attrition within Cisco is minimal, promotions to management positions within Cisco might be harder to obtain because few managers want to leave.