I only gave it a 2 out of 5 for now because I just used it maybe 5 days ago and yesterday I found a live bed bug. We went through all the recommended steps and more! I do know that the Steri-Fab works instantly on contact but not too sure how well the dust will work. The first day we did all the applications of everything we had found a live bed bug and put it in a baggie with some of that dust and in 24hrs it still wasn't dead (but not sure how long it would have taken because my daughter killed it). If I would have known that the dust would take that long than I wouldn't have purchased the kit.