Pros: -Really really small.
-Works.
-Different colors, I like to have a different color for each different size sd card I use, so I can quickly see how big the drive is.

Cons: -Bad design. I had several of these that looked identical on first inspection, so I bought this thinking it was the same, but there is a very tiny difference - the one I had before has the string attached through a loop in the plastic, so it won't come off unless the plastic breaks. These have the string attached through a loop in the aluminum, and *two separate pieces are used to make the loop*. This means the aluminum doesn't have to break for the string to fall off - it only has to bend a tiny tiny bit. So one string was off on arrival. One other fell off within five minutes of use.

Other Thoughts: -These are meant to be a thumb drive, not a card reader - you should not buy this if you want to swap out SD cards constantly, it is not easy.

Bottomline: -If you are just going to have this lying around your desk all the time, this might be okay. But because of the strings falling off, you absolutely should not use this as a keychain, you should never pull on the string to get it out of the USB port, you should never carry the thing by the string - it will fall off and you will risk losing the entire device.
Not recommended.

Pros: The size of the reader is very small. It's about 1cm longer than a microSD.

Cons: This microSD reader has lots of cons. I really hate how it keeps falling out of the holder.
The biggest con has to be putting your microSD in and taking it out. It is a really tight fit so you have to really push it in. And then when you want to take it out, that's where it gets hard. You can't just slide it out. It's very hard. What i do is apply pressure down onto the microSD and slide it out. I really hate that.

Other Thoughts: Thought this thing would be great but the moment i tried to put my microSD in it, i changed my mind. It's a load of shit.

Bottomline: Ah well. What do you expect for a $1 reader? Don't get it. It's crap.

Pros: Oque pode se dizer de bom é que é barato e funciona, mas apenas isso !

Cons: Parece ser extremamente fragil.
E a proteção que ele vem junto, não protege nada e atrapalha

Other Thoughts: Acho que o outro tipo de chaveiro cardreader que tem nos 2 USD gadgets deve ser bem mais resistente doque este ( mas digo isso apenas pela aparencia dele )

Bottomline: Na verdade não sei oq significa Bottomline em portugues =P
Que coisa chata isso dos reviews terem que ter 500 caracteres ( tenho agora que ficar enrolando aqui falando coisas aleatorias para juntar os malditos 500 caracteres... acho que já deu ! )

Pros: It's small and with the key chain attached makes it very convenient.

Cons: The plastic portion where the mircoSD card supposed to go in, was out of place causing the card unable to slot in at first. Then i noticed actually it cracked and can be removed, so I did. So what was left is the usb part with the metal strips that reads the card, without the outer layer which holds the card in place. However, still usable to read my mircoSD!

Other Thoughts: It is very cheap and user friendly but because of it's small size, I had a hard time plucking it out from my labtop's usb port.

Bottomline: If u need a reader on the go, definitely can consider. If u want a durable card reader then perhaps u should get something more sturdy.