This is technically a microSDHC reader, not a USB memory drive--the basic reader comes with no memory and you must add your own finger-nail sized microSD card. If you have multiple microSD cards or devices that use them, this is good for you. If not, it just means that if the reader gets wears out, you can probably just remove the microSD card and keep your data.
Transfer speeds will vary based on the speed of your microSD card; I have a class 4 card in mine. As a test, I transfered a 2.4 GB file to the drive--it transfered with an average speed of 15.4 MB/second, the whole file completing in well under three minutes.
I've had the reader for a few weeks now and have been using it occasionally and EDCing it in my wallet. It has worked well so far and held up to carrying. It is a bit fragile feeling--it's so small and thin--so I would be hesitant to carry it on a keychain.
If you're looking for an ultra-small USB drive for EDC or a mini kit of some kind (they fit inside OscarDelta DCTs and would take up little room in an Altoid kit), this is an awesome choice.
Amazon has very good prices on the reader and "Mobility Kits" that include the reader, a microSDHC card and various adapters. The standalone reader is $5.99
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