I held this position. Before taking or considering, on your ride-along with another rep, get the honest view of the manager. This is important. As soon as I accepted the position, I found out that every rep in the region despised the manager. The reason this is important is because it is a sort of "group sell" scenario with the manager directly involved, as well as other regional reps. I left a great job for this position, and realized right away that I made a mistake.
The are some really good managers as well. Do your homework. Good luck!