We have septic tank, it isn't awful we just have to have it pumped every 3-5 years and we're supposed to have it measured every year to check scum levels and what not. We haven't done that yet and have only lived in this house for 2 years. Next year is going to be the fun one :P
We haven't had any problems with it like it backing up or anything. you just have to make sure you get septic safe toilet paper.