I use both star san and iodophor. I use star san on anything plastic and use iodophor for everything else. Iodophor is way cheaper than star san, and I like it becasue I can mix up 5 gallons or so and fill whatever I'm sanitizing to avoid the whole shaking or rolling on the floor bit. Plus it doesn't foam up (lets not get into the whole "Don't fear the foam thing.") But, you need a longer contact time with iodophor and it stains just about anything except for glass and metal. Also, when I mix up star san, I only make enough for what I'm doing. When I'm racking or brewing, I'll mix up 1.25 gallons (1/4 of the instructed usage). If I'm making starters, I'll mix up 1/8 of the reccemmended usage. If I'm sanitizing a beer line, I'll make up a couple cups worth and just guess at the concentration. I brew a lot of beer, and one big bottle of star san lasts me between a year and a year and a half. A big bottle of iodophor lasts me a couple three years.