before we get too carried away, I think you should get a T5577 test card FIRST
I’m still not 
it’s compatiable
Yes that AND because NExT also has the High Frequency chip, if it’s placed next to another HF chip, you could experience some reading issues.
It is negligible, but through some testing we have seen that the xEM has slightly better range
I think this is the video
ALSO I just had a thought…
I knew it sounded familiar
HAVE A READ OF THIS