I came out of the Zimmer Sales Academy (ZSA) and have been with Zimmer ever since. I've been in the field for a number years. I will give you the most accurate description out of all responses.
ZSA is a great path for entry into ortho sales. I consider myself very lucky to be young and already in orthopedic sales. This, I owe to ZSA. This is not the only way into the industry, but it is probably the easiest. You are paid to learn, make numerous connections with the distributorships throughout the country, and have a very high chance of landing a job. If you do not get a job out of ZSA, you can either try to get a corporate job with Zimmer, or use the experience as a resume booster to find a job with another company.
While in ZSA, you make an annualized salary of 60k. They keep changing the duration of the program, so I am not sure how long it is anymore. Regardless, you will make good money while in it; probably more than you would at any other entry level job straight out of college.
Once graduated from ZSA, you will be placed into whatever territory/distributor needs a rep, believes in the ZSA program, and doesn't want to pay a whole lot of money for a new rep.
I was placed into a territory that is managed by a team of reps. I was never publicly considered a "junior rep" or "assistant rep", but that is what I was to the team. The first few months, they put me in as many cases as possible to get me adjusted. Once I proved that I had learned to cover cases, they started having me cover them alone. After 8 months, I was given the go-ahead to start selling and basically had the training wheels taken off.
Being young and new in a territory DOES NOT lend itself to immediate success. It takes a ton of time to establish yourself and have surgeons trust you advice. Selling to competitive guys is even harder as they see how young you are and immediately discredit whatever you have to say.
It has taken two years to gain any kind of traction with competitive doctors, but I am getting closer to a couple conversions that will hopefully take place this year.
As far as pay is concerned, other ZSA graduates and I started on salary ranging from 45-55k. Once you have proven yourself, you most likely be moved to commssion or base+commission. I was moved to commission after my first year that was calculated based off quota to come out to be very similar as my previous salary. Slowly, my pay has gone up, but never by a commission bump. This will only happen if a convert a surgeon.
The only way to raise your income drastically in this industry is to convert somebody and use that new business as negotiating leverage. Or, you need to switch companies because people always pay more for a competitive company's reps due to the competitor knowledge gained and the potential for his surgeons to follow him to the new company.
All in all, this is a good program with good long term outlook on your career. Expectation of a $100,000+ income shortly after graduating is quite lofty unless you have some luck on your side.