Pros: Seems to work very well in Australia (at least on my wife's phone with Optus). Placed the jammer outside and it knocked out her phone inside the house from just over 10 metres away. Walls do affect the jammer's ability. In an open area I think the range could be 15-20 metres.

Cons: Same as all the others. Button can be pressed too easily. needs an o-ring glued around it for protection.
Antenna mounts are very fragile.
Not too sure about charging from the car charger as I couldn't get a proper voltage reading from the output. It's supposed to be 5v but I couldn't get an accurate measurement.
Suggest buying another mains USB adaptor as I don't trust the one supplied.
Takes about 6-7 hours to fully charge before auto cutoff.

Other Thoughts: Came packaged in plain white plastic and marked as "Gift". These are illegal to own in Australia, but it came through customs unopened.
Charged it for 5 hours (computer USB) and the charge light didn't go out (battery stayed cold). Took the thing apart and the battery measured 3.95v. I charged it for another 2 hours and during that time the charge light went out, so the auto cutoff works OK. Voltage measured 4.02v (Fully charged should be 4.2v, so the charging is OK)

Bottomline: Excellent value for money and it seems to work as it's supposed to. For the price I don't think anyone could do any better.
But be careful of the car and mains charger!!