I use Concur with a very large company, we use it for booking and expensing.
I love it. I book the trip, the itinerary imports into my expense report and auto-fills the perdiem and allowances, it assumes all expenses on my linked charge card is from that trip and imports them all. It auto-links hotel/air/rental charges with the relevant reservation.
On the go, I use the Concur app to snap photos of all receipts, and then attach them to the charge when it hits and appends to the report.
Concur also has electronic billing directly from most major vendors (airlines, Hilton, Marriott, Hertz/Avis/etc) which submits and auto-connects the e-receipt with the charge, removing the requirement to scan and attach the receipt.
Again, this is with a large company, and using Concur for everything (booking and expensing). I don't know how well it works if booking is separate from expensing, or if you don't have a single card to link to the account.