Summary: I would be wary of using these as boot drives, but for general portable file storage, they're a fantastic deal. No comments on longevity since I haven't owned them very long. I bought 5 of them so I should have a good sample size to test for early failure.
Pros: Casing is a single piece of aluminum that feels very solid. This thing has been riding around on my keyring for a week or two and shows no signs of wear yet. No cap or moving parts which I consider a plus because those things just break or get lost.
Cons: Very slow writes; took me over an hour to write a bootable Windows 7 iso (3GB) to the drive. Although I will say that I didn't notice any serious read-speed issues once I plugged it into the machine where I installed Windows.
Summary: Been using these drives for several years and own a bunch of 16 GB and 32 GB models, as well as a couple of 64 GB drives I bought a few months back. I have never had one of these fail and all of them work as well as the day I got them.
Summary: This is one cute, sexy little flash drive! I needed one for emergency and ran to staples to by a different brand 64GB before this one arrived - it is easily twice the size of this one and no where near as cool looking (see pic). I will certainly buy more of these.
Summary: I mainly purchased these for USB boot images and they are working great (I've had problems with some cheap off brands trying to get bootable USBs setup). While tiny, a label maker will stick fine to them.
Pros: It's one piece of metal on the outside; it won't bend and break. I typically will ruin a flash drive every other month or so. These should last for me.
Cons: The really con is that it is USB 2.0 - slow. A r/w button someplace would have been nice.