I'm fairly positive it's a Feigao as they do a lot of mfg for private labels. Their sizing is identical to some re-labelled Feigaos from other brands. It's a 2-pole motor, so it won't behave like a 4-pole. I don't have a problem with the price, but "backed by KD's legendary service" makes me laugh. There are quite a few unhappy Kershaw customers, myself included. He ripped me off on a small part and instead of doing a small thing to make it right, he basically gave me ZERO support and I lost my money. Legendary...perhaps...just the wrong type of legend.
If you call up Feigao, they'll make you any motor they offer (sensored included) if you order a minimum quantity. Some of their product line includes 44mm 2-pole motors available in 65mm and 74mm lengths. Gee, that sounds familiar. I've had Feigao, KD, and rebadged Feigaos. I didn't have a problem with any of them aside from the KD running very hot. The rebaded Feigao has removeable rear endbells unlike the standard Feigaos, which is nice. I don't have a problem with what they offer. You just have to accept their limitations given their price.