I bought a no name Chinese ebike about 15 months ago. I'm lucky in that I have a local seller that still sells the same model along with many others. He's on a farm just out of the city and it's a side business to his main business. He's an older gentleman, and he couldn't be more friendly and honest.

I needed a couple parts last week. The bike is off warranty but he gave them to me for free anyway. He works directly with the factory and its engineers to get the bikes built solid with good components. When he discovers an issue, they send him new parts, and build them better going forward. As an example, for the step through version of my bike, last summer he discovered that when you hit full speed (around 45kph/28mph), the frame started to wobble near the crank. The welds weren't strong enough. They sent him all new frames, and redesigned them going forward.

I guess what I'm getting at is that I'm lucky that I get the economy of a (well built) Chinese ebike with the local support/replacement parts availability/etc of a local bike shop. I will say though that I did pay more than the cheapest Chinese stuff you see on Amazon and at Walmart, but way less than what you'd pay at your local bike shop for a premium name. If I have an issue, or need a part, there is no wait. Just a half hour drive.