As one of a group of 8 who travelled from Hoi An to Hue with this company, I would not hesitate to recommend them to others.
Leicester_Gav has summed up our experience of the day nicely, which is to say that the Easy Riders made every effort to ensure that our tour was fun, insightful, scenic and a truly memorable experience.
As a taller rider (6ft2) I did have some reservations about riding pillion for an extended period but these fears were quickly allayed when we were picked up on large bikes which proved to be very accomodating and comfortable throughout.
Our tour riders and guide were very knowledgable about the sights we visited and contributed significantly to our enjoyment of the day.
Motorbikes really are a fantastic way to see some of the 'road less travelled' aspects of Vietnam, and when I come back to do it again I can assure you it will be with these guys.