What do you guys use to charge these 14500s?
A Hyperion 5i AC/DC RC charger. DX has one that is functionally identical but less expensive and a bit weaker, but you don't need fifty watts to charge cells for flashlights.
As for the sites in question, my experience is as follows:
DX have always, and I mean always, answered my inquiries about products, have twice given me replacements for free and have once re-sent a lost item even after I'd admitted to losing the receipt slip that came with the first part of the order. Ok, it *was* a $4 item, but still. They were also supportive when I got a product that worked less than splendidly and wanted to replace it with a different model - though in the end I kept it out of sheer laziness.
They also tell you when they ship, if there's trouble in shipping, and so on.
This in at least ten orders.
In contrast, my orders on KD (all two of them) were acknowledged, and then I had no further contacts with them. Both items eventually appeared in my mailbox more or less at the expected time, but I was left completely in the dark in the meantime.
Based on this, I definitely prefer DX - although their selection of cheap mp3 players is vastly inferior when compared to KD. In contrast, DX's selection of RC stuff is superior to KD's (last time I checked). For everything else the availability seems to be more or less equal.