They're inexpensive ebikes with small, 350 watt hub motors, no brand given. Just look on Alibaba.com and you'll find multiple suppliers of models like these. There's no specific maker of the battery cells (which makes it risky) and it would be logical to assume that the other Shimano components are intro level, although this distributor does not specify. Take a close look at the welding on the frames and it's not particularly strong or smooth looking.
All the specs on these ebikes are very sketchy and there's no warranty listed. Since they do not carry any stock on hand; they are drop shipping from a plant in China (that's stated in the FAQ's). They don't even stock replacement parts of any sort; not even the battery, controller or motor according to the FAQ's. They're looking for buyers who just want a $700-$900 bike. Go to the product pages and you only get a little more info. On the Cruz King, they don't even clearly state that the battery is Lithium. You don't find out about the $179 shipping until you are in the checkout, so the $899 bike is actually $1078. These are not comparable to $1700- $2400 ebikes like they claim; they're probably just an ok intro electric bike. However, you'd be better off buying an inexpensive ebike from X-treme which comes with no extra shipping fee, a clearly stated warranty with the option to purchase a longer warranty for $50 and a complete tech support team with parts & accessories available from a company that lists an actual address, not just a website! Think about it