Cheap 18650 Li-Ion batteries from China - are they worth it?

18650 Li-Ion Batteries

China is a magical place where you can get everything for a fraction of a price. Like 10000mAh 18650 LiIon batteries for $1.5. Of course, we have to begin with a note, that there are no 10000mAh 18650 batteries. Technology does not allow for such energy density. And if they would exist, they would not cost $1.5. Closer to $15 probably.
Anyhow, I've bought a couple of cheap 18650 on Aliexpress and tested them with a DIY OpenSource OpenHardware Arduino based battery discharger. Here are the results of super brands like Mr. Henry, UltraFire, GTL EvreFire, SkyWolfEye and so on... Are they worth the price? Well... my discharger says: NO!

Results:

QuadMeUp Discharger on GitHub
INAV Stickers:

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