The connectors have different shieldings now. The magicshine clone I bought failed when I plugged in a 8.4v fully charged battery, it fried the driver. My yinding (gemini clone) otoh works terrific, super bright. The QC failure rate rises dramatically when you start spending less than $25-$30. Spend at least $40 if you expect something to last, my $50 yinding is an absolute beast and the quality is superb, and it's smaller than my mg clone, my $25 magic shine clone is so-so.

So IMO, spending $50 is the sweet spot, you'd have to spend around $150-$200 for a brand name "quality" light to get the same amount of brightness out of the $50 yinding.