Pros: This nice looking pouch has quality look and feel and good size to fit most phones or mp3 players plus some small accessory (memory cards, ear buds, and etc.)
It has two sections. If you put your phone into the outer section, it works as usually. So you can use the pouch for your phone all the time, not just when you need to block it. There's also another (inner) pocket made of gray cloth which is electromagnetically shielded. If you put your phone there, its radio signal is blocked and it goes away from cell network just like if you went into a metal garage, metro, and etc. making you a good excuse for not being available via phone :)
You can also put there an mp3 player if it's prone to catching noise caused by nearby cell phones.

Cons: None.

Other Thoughts: After putting your phone into the gray pocket, wait for a few seconds and try to switch the phone through the pouch, without taking it out. Without that the phone will be trying to reach to cell network using its full power in vain and will drain its battery pretty quickly.

Bottomline: Buy one, even if "just in case".

Pros: Its large enough to hold a large cell phones, Like that Blackberry Storm



.

Cons: It dosnt do anything!
I bought it, tried sticking 2 diffrent cell phones in it, and it just didnt work!
I stuck 2 diffrent phones, one iDen and one BlackBerry Storm,
Both got high signal level while inside the pouch
maybe my units defective, but it really dosnt do what it said it does.
no clue whats wrong and what can i do about it.

Other Thoughts:

Bottomline: If you want a cell phone ugly pouch, then its good
but it dosnt block the signal!

Pros: -It's very cheap!
-Has a nice leather feel.
-It really blocks all of the cell phone signals and nobody can call you!

Cons: -For me, the leather on the outside started to wear out and rip. =( Other than that, yeah, really good.
-For this pouch to work, you'll want to charge your phone EVERYDAY. Since your phone has no signal, your phone will use more battery life to try to retrieve a signal.

Other Thoughts: I tested out the pouch. I put my phone in the pouch, used my sister's cell phone to call. It works and it doesn't ring, even when I left it on Ringtone:loud. However, I heard my sister's phone and said the same operating message. :(

Bottomline: I usually forget to silence my phone, so this pouch helps it, so my phone doesn't get confiscated! XD

Pros: a phone in the bag can't definitely get no signal! A phone only is using more energy, so your battery will need to see a charger more often. :P
I have a FiiO E3 amp which is very sensitive to phone signal, it makes a lot of "phone noise " when somebody is calling. With the amp in this bag there is no "phone noise" anymore.

Cons: can't find any. Maybe another color or another size? But this is something personally

Other Thoughts:

Bottomline: nice bag which blocks mobile phone signal both ways! Very useful if a phone may not be used or if a device may not receive any phone signal.