Where do I begin?
Our guide was incredible; funny, great English, young, easygoing and always looking after us! Our driver (less English) was also great. We took a 3-day 2-night tour of the Mekong, and there was only two of us on the tour.
The blurb on the website is right; heading through rice fields, into villages, past monks and temples. If you want to experience the real Vietnam, head on a tour with Vietnam Backroads, because it is truly the backroads and the local life that you will experience.
We didn't see a tourist for the whole time (bar a few at Can Tho at the floating markets). The itinerary and amount of cycling each day is totally flexible, and the bikes run well. The guide also carries tools.
Lastly, if you want to taste Vietnamese food, then go with Backroads; our guide made us try pretty much everything in sight!