Pros
Unishippers provides a solid foundation for a career in sales. They provide good sales training, a good product to sell, and the flexibility to manage your own success. Unishippers is a great stepping stone to gain experience and move on in your professional career. If you can find a specific industry nitch, then there may be opportunity for great success.
Cons
Unishippers is limited in their global reach and diversity. They are particularly strong in the domestic LTL and Small Parcel market, however, they are not very strong in the international market (ie. air freight, ocean freight, customs brokerage, cross-dock, supply chain management). Also, their system for sales reps could be better. They impose a margin requirement which doubles each month. It eventually ends up eating into your profit margins and burns out the sales rep. It is no surprise why sales reps don't last there more than about a year or two.