works but could be better

The soda stream works ok but I have 3 of them and unfortunately I find they do not get as bubbly as soda in the store. Its easy to use but they do go through carbon tanks quickly and they are not cheap they run about $17 to replace. I find its actually cheaper to just buy pop on sale when you considered the soda flavors you have to buy along with the tanks it can be more expensive than the soda