The mice in my house ignored the set of 4 ...
929789
The mice in my house ignored the set of 4 traps.  Tried different baits and locations. I finally placed 4 snap traps and caught 2 mice that night.
695716
It obviously doesn't work for me.  I bought a package and put 4 pouches all around my rv interior.  The mice built nests right next to two of these packets.  So much for their repellent qualities.
410931
I bought 2 packages for a total of 6 traps.  One caught a mouse and made it easy to handle.  However, one was broken when I took it out of the package in that it would not lock in the "set" position.  A second one snapped without catching the mouse (I understand that happens; that's not the problem) and after that it would not lock in the "set".  That's one third of the purchase that had to be thrown away because it wasn't worth the cost of return.
1790490
These traps literally do not work. We had 10 mice roaming our house for months. I put these out near their path and the mice completely ignored them. I had to get glue traps to take care of the problem.
2100340
The trap itself looks like a mouse.  One mouse was killed but not invisible. I am terrified by mice, so this was not a solution for me.
3620172
Have not seen any mice since I put these out in our rental home. There was also a funky smell in our laundry room when we moved in this made it have a much nicer smell.
658547
I don't know if it was because of this product or not, but after a day or so the mice stopped coming.
4802854
Been a month or more since I bought 3 packages of these. Put one in every room. Mice still seems to be showing up
1522579
I read the reviews carefully about mice and based on the layout of my house and knowledge of the circuits I ordered 4 units, and placed them at the extremes of each circuit (2 downstairs, 2 upstairs).  After about 10 days the mice seemed to be staying away.  We accidentally unplugged one and the mice were immediately back in that area THAT NIGHT so I do think these units are doing something. I would give 5 stars but the units themselves are cheap-feeling and have an annoyingly bright flashing light. You can plug them in someplace you won't even see and so that's a minor problem (or just cover the light with a piece of tape).

Update: a few months later I'm finding these units completely ineffective in the kitchen, so I've downgraded it to a 3 star.  I've got three of them concentrated in the kitchen circuits and we're still catching 3 - 4 mice every night. (Unfortunately we have dogs that are hostile to cats!)
746787
I plugged in 1 of the 4 sonic pestchasers in my kitchen.  No change with anything.  So, I plugged in a second one and then a third and eventually all 4...all with no change  The bottom line is that I was unable to see any reduction in mouse sightings or mouse urine and droppings.  I hope that they will take these back and give me a refund.
1064554
Recently we found a lot of mouse droppings around our basement and garage.  I bought this 4 pack and set them up per the included instructions (no food, just placed them facing the wall where mice frequent)  Every evening and morning I went around and checked all the traps.  In just under a week these 4 traps killed 16 mice!  Its been a few days since the last kill, and I haven't seen any more signs of mice.
4639269
I had to take these mousetraps over to my brother's garage to install them, as I do not have an issue with mice at my home. We tested them (2 different traps), and one trap did work, but the other one failed. The mice got fed, though. Oh well, at least it was not so important to remove the mice from a garage, as it is from a house. I would look around for a more reliable product if you are facing an infestation. We don't need to make our pests healthier by feeding them, too!
1872920
Perhaps the mice in my house are deaf.  Or this is a mouse attraction.  Either way it didn't work at all.  Mouse droppings were found a couple of inches from the contraption while it was plugged in and the light was on.
99576
After reading the rave reviews I figured I would set this up and be catching mice like crazy. So far Ive come up completely empty. Signs of mice everywhere, using tiny amounts of peanut butter, yet nothing. Honestly it caused a lot of frustration; especially after I went to the hardware store and bought two cheapies and had two mice in no time.
This trap = frustration for me, I'm glad it works for others
3483121
They are sensitive as they should be. Mice don't weigh much. If someone thinks they are to sensitive and hard to set ... probably too much peanut butter... it just needs a tiny bit for smell. Try setting two about six inches apart and if you have mice .... you WILL catch the lil pests.
4479854
Well there are mouse turds all around the trap but no mice inside.  Placed a glob of peanut butter on the inside.  I will have to look for a trap with a different mechanism.
1390799
I kept using snap traps and could never catch the ever-elusive mice.  I put this trap in the house and ever since, I have caught 5 mice and they've never eaten the bait!