Pros: It works just as advertised, sturdier antennas than I thought they would be. I simply took the white packaging material, drilled 3 holes (size of the antennas) , cut it to size, and put it OVER/ON the antenna's to protect them from getting bent/broken. I'd recommend this, as it's easy and fun to do, and will make it last a long time. I opened it up, and there was about 5 'adjustable pots' on the circuit board, which I DID NOT touch, as there is no indication as to what goes to what. Overall very happy, worked cutting out 3 in use phones on the bus (about 5 metres away). When used in the mall, it was difficult to cut out, as it was in a pocket. I'd recommend it in a bag off your body as your body absorbs the radiation.

Cons: The button can easily be pressed, so simply take a large elastic (the one you find around Broccoli) and put it around twice, one 'strap' around each side of the button, then use a hot glue gun, and glue a 'ring' of glue, making it harder to accidentally press the buttom.

Bottomline: Recommended, but maybe a bit pricey, seeing as the total parts don't cost much. The shipping box was HUGE, I mean it was HUGE!!! The actual unit is, in length, the length of my hand, and the box was HUGE, they could have packed it in a smaller box, but I guess you needed room for the 2 chargers (car and ac) the manual (not good for CUSTOMS!!!), and the packing foam (for the antennas...lol)
Go for it. But don't jam for long or ppl will get suspicious.

Pros: This device works right out of the box. Charged her up and we were off. The black metal casing looks sleek and hearty. Operating it is as simple as turning it on. It works well in Ontario Canada, cutting all cell phone signals. It did not require any tweaking or tuning, so I didn't have to open it up at all. Perhaps this is a later iteration of it than others that complained it needs tuning.
I used it on the bus and silenced two teen chatterboxes/cell phone abusers.

Cons: As mentioned by others, the on/off switch is poorly thought out and allows for inadvertent switching.
It looks like a detonator, so I wouldn't advise waving it around yelling "AiAiAiAiAiAiAiAiAi!".

Other Thoughts: I felt really guilty using this on the bus the first time I tried it.
One of the teenagers that I shut down looked really sad that her phone wasn't working. She kept stroking her phone like it was an injured pet or a sick baby.
When I was nearing my stop, I the device off. The other teenager called her boyfriend back and gave him an earful because she thought he blocked her call.

Bottomline: I am very pleased with purchasing this device. I resolve to be diligent and use it responsibly.

Pros: This device is inexpensive and works quite well. I'm a teacher and as others have posted, this is excellent for eliminating texting issues in my classroom. But the shipping on this product leaves much to be desired!

Cons: The shipping on this product leaves much to be desired! Unlike other reviews that I read, this unit WAS packed with detailed instructions identifying it as a "blocking device." Worse yet, the EMS address label states in black and white the contents as "Personal Cell Phone Signal Blocker Device." Not very stealthy folks!

Other Thoughts:

Bottomline: 'Not sure I would order again from this company until they get their "shipment privacy" issues resolved. Otherwise great product at a great price although shipping was slow. I paid extra for air and received it in the central US 14 days after ordering...

Pros: This little baby is awsome ! I just did a test in a 60' mobile home. I turned it on & placed it in the extreme front corner of the coach, the I went to the extreme rear of this coach and to my suprise it blocked my ability to call out at that distance. Maybe I got a fluke, but if they all work this good, I am going to order 6 more.

Cons: Havn't found any yet other than while traveling in the car with the windows up it seems to cause restrictions in distant ability.

Other Thoughts: I wouldn't part with it.

Bottomline: Can't be beat. It was not too long ago this baby or its counterpart cost up to $ 300.00