It depends on where you are headed Killudead. If you are looking to get a planted tank going, the hood, light strip that comes in a kit is almost useless and you will be replacing it. Most kits come with Hang On Back, HOB, filters so if you go with CO2 you would also be replacing that. What you are left with is a thermometer and heater and a small sample of fish food in most cases. That would be a terrible waste of money on things you don't use, as MWood said. On the other hand, if you are going for fish only and have no problem with a HOB filter, the kit can be quite cost effective. The real question becomes how much of the kit you would end up using and whether you would be happy with the particular components that are included.