I haven't worked for one. Interviewed with a couple in the past.
The pay is amazing, but be prepared to do lots of traveling (many cover multi state territories with hundreds of accounts they see each month, required travel to the US headquarters usually quarterly, traveling to territory workshops, traveling to conferences in your territory), also be prepared to be work at least a 60 hour work week.
It's an awesome way for a younger audiologist to bank good money, meet hundreds of contacts for future jobs, and if you love to travel it's great.
I interviewed with a couple of companies right when I first started dating my wife. I only didn't take the jobs because I wanted to stay close to my wife at the time since I knew she was the one so my career took a backseat for that opportunity.
Oticon treats their employees very well. Most of the reps I've known who worked for other companies seem to always stay at Oticon once they join up with them.
So if you're younger, love to travel, kind of a workaholic, and you have relatives you can live with who live near a major airport then it's an awesome way to meet lots of people, travel a lot, and bank a lot of money to pay those loans down.