Pros: This is an excellent product!
As with all hearing aids, how well this works for you depends on the type of hearing loss you have. If you have mild to moderate hearing loss (usually without deep nerve damage) or are basically just hard of hearing, this is an excellent product.
The tiny hearing aids that you see advertisements for in magazines and websites that go inside your ear are garbage. If you want a good, functional hearing aid, you're best off getting a hearing aid with a speaker/receiver/amplifier that goes behind your ear with the mold going inside.
When I was a child some 20 years ago, my hearing aids were basically the same thing as this and cost 600 USD per ear piece! This is an unbelievable price for a great product.
It uses a standard hearing aid battery and the battery lasts a very decent time.

Cons: This hearing aid comes with 3 different molds for your ear and the molds are like an earplug. In other words, there's a decent chance that the mold won't fit your ear exactly, which would also cause feedback.
However, there are several solutions to this. In America, you could always go to an ear doctor and have them make you a new mold. They would make a mold that fits your ear exactly. I don't know how much it would cost though, is the only thing.
There are places where you could buy standard ear molds for cheap.

Other Thoughts: Remember, when using a hearing aid, you need to try and keep your ears clean.
You should keep toothpicks and hydrogen peroxide in your bathroom. Hydrogen Peroxide is excellent for getting wax out of your ears; if it's bubbling and tingling, that means it's working! Once the tingling slows down, empty out your ear and it should be fairly clean. Use cutips to clean out any excess wax if you wish.
The toothpicks are to dig any wax that gets into the mold. Be careful not to poke holes in the mold, of course.

Bottomline: I picked these up for my grandmother who uses them. I will be ordering two for my mother who is starting to lose her hearing.
I've already suggested this hearing aid to my ear doctor as a cheap alternative for patients without healthcare.

Pros: Comes in a nice box with ear plugs of various size to help with the a good fit.
Ear piece spins for either side of the head.

Cons: Feedback and size.
It seems as if the ear piece doesn't fit in the ear correctly there's feedback at the higher levels.
The "cord" is seems a bit short on the various members of the family that have tried to get this to work as we expect it just doesn't fit correctly.

Other Thoughts:

Bottomline: If we hold it to the side of the head and set the level to something that doesn't create feedback it works as well.

Pros: Good hearing device, it as button on/off ,
not all of the kind have one, sound quality is great, it already comes with 2 very good bateries, and the box where the device is store is very nice and safe, and one batterie least for 2 weeks, what is absolutly amazing compared to other devices alike

Cons: the only con is the size of the device, instructions not very clear,

Other Thoughts: i think that it need a a more detailed instructions,but other way its a very good product.

Bottomline: if you need a device with quality and dont worry about the size of the device, this is just what you need.

Pros: cheap, easy to use, easy controls.

Cons: creates a little echo for high volume use

Other Thoughts: It is not the best product in the market but if you are looking for a temporary solution or if your hearing is not imparied too bad, or if you want to test a cheaper model before you commit to buy a more expensive model, you may consider buying this model.

Bottomline: (i think) its a cheap and temporary (or maybe a backup) solution.