ACR122U USB NFC Reader

So this is pretty much a good buy? https://www.amazon.com/ACR122U-Reader-Writer-Bonus-NTAG213/dp/B00OEB7U3G/ref=sr_1_2?ie=UTF8&qid=1497386972&sr=8-2&keywords=ACR122U+USB+NFC+Reader

Also, why exactly is the ProxMark or the ChameleonMini so much better? What makes it so good?