Pros
If you get the right mentor and make the right connections you can make a lot of money there over time. Large company with many employees that have worked there for long periods of time. You will meet some great people at TriNet.
Cons
Veteran reps have a lot of connections within the company and from their time at the company to help them achieve their number so they prospect differently than rookie reps have to (this is not a knock on them this is how things are supposed to be) the issue is that you don't have anyone that you can turn to for help to book cold meetings and build your network because successful people aren't hitting their number this way. You are expected to book cold meetings without anyone being able to help you figure out how to build your business because the way that companies are buying is different than when they did 4+ years ago. If you decide to work at TriNet go into it and soak in as much information as you can during training and do your best to create a book of business that you can reach out to when you first begin to get you through your first year. Also, be ready to spend countless hours scrubbing accounts and scouring the internet for new accounts. Reps will give you the commonly known places to find accounts but keep the information of how they are finding new accounts a secret because they don't want other people to get to the businesses not in sfdc before they do.