What is Reddit's opinion of MIFARE++ Ultralight?

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So I used an app called mifare++ ultralight https://play.google.com/store/apps/details?id=com.samsung.sprc.fileselector because that's the kind of tag it is, it's free, and it reads raw data.... So I'm hoping it has the best chance of copying it.

Here's the file, it can be imported and written with the above app. http://s000.tinyupload.com/index.php?file_id=07949970405958685654

This will get you started: https://play.google.com/store/apps/details?id=com.samsung.sprc.fileselector The cards aren't just an encrypted blob. There's a definite structure to the data, if you compare a bunch. You can also write to the cards with your phone, but I have a feeling it switches some security bit and the card will cease to work with translink. That's as far as I've gotten, and probably as far as I'll go. It's fun reverse engineering it, but getting caught costs way more than the money you'd save hacking it. Still though, they're a free source of rfid stamps if you're willing to scrounge around for them!

The app is MiFare++ Ultralight . I'm on android so not sure about apple.