K.R.
Absolutely!!! My son was 11 1/2 months old when my daughter was born. They are now 3 and 4 and even though my son is a bit big to be in the stroller I still use it. It is a MUST if I have to shop by myself. My husband is a physician so I am on my own a lot and we don't have any family around so it has been a life saver for me. I would recommend the tandem and not side to side. There isn't a lot of aisle room anywhere.
When they were smaller I put the baby carrier in the back but now that they are older I put the bigger one in back and the smaller one in front for easier "driving". Even if you only use it for a year or two it will save you from many headaches. I love it because I can look at something and know my kids aren't running everywhere or getting lost.