I did Medifats for a little less than a month in January 08 and lost more than 20 pounds in one month... The weight was just falling off... Was it difficult? The first week was SO hard but after that, it was easy... My advice to you would be to look up some Medifast recipes (or PM me if you want) that you can do with their product. Like I would use their soup to make bread, their shakes to make ice cream... ect.
I still have TONS of boxes from the program but I haven't been able to go back on the program since I found out I was pregnant in February 08 and I am still exclusively breastfeeding...
The forum on 3fatchicks about Medifast is great also! I used it extensively when i was following teh program!