I have one of these in the back of my poor man's Wii U (basic) and it works great.

Heated, topps :smiley:

I have a couple of these. Upload speeds aren't great and they do get a bit warm but they do what they're meant to do and I'm happy with them.
Being able to write on them with a Sharpie is a bonus.

I've got two 8gb ones, one failed after a while but the other is still going strong a few years down the line. Lost the lid a long time ago mind you!

Some good deals in other capacities too:
Aqua 16GB - £2.98
White 16GB - £2.98

These are very slooow

I have these for my clients (I'm a photographer ) , they are OK but as others have said they are super slow