Real short. I have used the Slime Lite tubes in every bike I can. I have had amazing good luck with them, and I don't have to work with the bottle of the yucky stuff.
If you are going to throw out the tube everytime you get a flat, your bank balance is likely to go down pretty fast, especially if you live in an area with a lot of thorns. A well patched tube is as good as a new one; products such as slime exist as they seal a hole (as long as it is small) without having to go through the trouble of changing the tube or patching it.