Upside is well suited for businesses that have to change travel due to unforeseen business forces. It is well suited for small businesses that do not have administrative support needed to accommodate constant change. The Upside tools can be accessed from anywhere and support can take any issues on to help make the trip successful.
The support from Upside Business Travel is absolutely amazing. Immediately after you book a flight, you get an email from your representative. You can contact them at any time and get them to help you with anything you need or answer any questions. I have used the support before to get an earlier check-in, change flights, and add a night to my stay.
I've used Concur and Egencia in other companies. Upside is more user-friendly than Concur, which can sometimes be complicated with the number of menus you have to go through. It's so far ahead of the experience I had with Egencia, I can't even describe it. Egencia's customer service was hit or miss - to the point of being a running joke among the assistants. I've never had a problem with Upside's customer service.