Yes it smell funny, and yes it will slightly discolor vinyl tubing (although it does not stain my plastic fermentor), but this stuff kills what you want dead. I had an airlock filled with starsan that the krausen bubbled into. I pitched that starsan/krausen liquid from the airlock into an equal amount of mild table sugar water mix that I boiled, and within 12 hours this new solution was fermenting. That tells me that starsan is not a very effective yeast killing agent, and online brewing forums seem to support the idea that iodophor is more effective at killing yeasts and souring bugs like lacto and pedio, something starsan is known to struggle with.