2-in-1 M2+MicroSD/TF USB 2.0 Card Reader Keychain

Pros: Perfect shape and size :)
Easy to use, easy to wear on a keychain
I was able to use it with Transcend 4GB MicroSDHC card!
Transffer rate is very good.. arround 6 MB/s during file copy.

Cons: I was disappointed to find that large M2 cards are not supported :(
Try it with 512MB, 1G and 2G with no luck :(
But it works with 64MB card.
MicroSD cards are very hard to be taken out.
I have to disassemble the reader to be able to get my card.

Other: Perfect size, easy to use, supports MicroSDHC with good read/write speeds, but can't use large M2 cards

Pros: Made of hard plastic. Small size and easy to slip into even a wallet pocket. Feels like it is a good-quality item. Nice matte finish to housings. Purported to read M2 as well as microSD but I've only tested it with the latter.

Cons: The price is rather high but this could be a reflection of the quality - I wanted to try something better than sku.6108 which is not dependable.
When inserting microSD cards if the alignment is not perfect it feels like I might be bending the pins.

Other: So far so good - I think that this is a good unit to depend on.

Pros: Made of hard plastic. Small size and easy to slip into even a wallet pocket. Feels like it is a good-quality item. Nice matte finish to housings. Purported to read M2 as well as microSD but I've only tested it with the latter.

Cons: The price is rather high but this could be a reflection of the quality - I wanted to try something better than sku.6108 which is not dependable.
When inserting microSD cards if the alignment is not perfect it feels like I might be bending the pins.

Other: So far so good - I think that this is a good unit to depend on.

Pros: It's small and also very handy due to its low weight. Made of durable plastic. Reads both microSD and M2 cards. Good transfer rates: 6MB/s for reading and 4.3MB/s for writing with regular SanDisk cards.

Cons: Easy to loose unless used as a keychain. It weighs close to nothing, so you wouldn't even feel having it in your pocket. Had to insert microSD card prior M2 to make it read the latter, though now it doesn't need that to work.

Other: If you need a reader that accepts both microSDs and M2s, I would surely recommend buying that one.