It probably depends on which older version you are looking at. The only concern I can think of would be the USDA nutrition database that is used for the backend. You want to make sure it's fairly current, to make it easier to enter your recipes and get correct nutrition results. Otherwise, I don't think there is much of a difference, at least in the last few versions. To be honest, I don't remember what the older versions were like, even though I had them