I have used these in two locations, the first in a garage that has a lot of delicate items that bugs could be a major problem, seems to be working. It's early here in Colorado for major bug season. The 2nd location was around my tomatoes that I grew all winter in a contained warm location. Lots of fruit flies. The strips had no effect.
The old Shell strips were great, but I'm guessing something bad was contained in them-can't find them anymore. Thankfully Gov't is protecting us since we grew up with asbestos everywhere, mercury fillings, etc and I'm still kicking at 68.