Pros: Now that all of my computers have USB 3.0 ports, I am in the process of selling my 2.0 drives and replacing them with 3.0 drives. Many of my older flash drives were SanDisk of which I had never experienced a failure -- so when I spotted the SanDisk Extreme 16 GiG on sale for $19.54, I bought one to benchmark.
Pros: Solid build quality, and design notes that put function over form slightly.
Cons: Drive itself is a bit long, but not so much as to interfere with your keys. The keyring clip section seems a little thin, but I have yet to see any wear. Price is a bit high for the storage space currently, but you'll pay a premium for USB3.0 until the tech is refined.
Cons: It comes with crapware preloaded onto the drive, simply reformat the drive as soon as you get it to remove it (you can always download the crapware from the sandisk website if you really want to experience the definition of horrible.
Summary: The clip ring opening is thicker than most others but still too thin to reliably hang on a key chain. It will eventually break. A thicker, steel reinforced clip ring would make this drive perfect.
Pros: First thing I did with this drive is to copy all the software on it to another drive and reformat it to NTFS (comes standard as Fat 32). Then I put the security software back on it.
Cons: Has this really dumb SanDisk Club software which is just a way to sell you more stuff from San Disk and their business partners. Delete it immediately.