"First one was busted, Second Works fine"

I bought this for my new samsung galaxy s 4, and the first one I ordered produced formatting issues on my phone every time I rebooted. I looked online and found a number of these got recalled (or something) at one point, and some didn't but just don't work.I returned it for a replacement and the replacement has worked fine in my phone with constant use. I'm on month 4 with no issues.

"how small is small?"

it is extremely small. so small in fact, that it could easily get lost. so i recommend that once it's in, you leave it in. but it's a great idea, to allow the camera's, phone's or any other device to be that much smaller. i've only had it for a short while, but so far so good.