Regardless of the moral virtue of the sellers, electronics from China, ie, most consumer electronics these days, has a serious failure rate. That includes video
cameras, radios, timers, battery chargers, moniters, thermostats, just about anything with a PC board in it. I went through three items in one week last year, a video camera, an ASUS high end router favorably reviewed by wirecutter.com and a usb hub. The router and camera cost me a full day each because they appeared at first to work and there was NO reason for their problems.
Thus it makes sense to search not only for what you think you want, but also for vendors with a large number of feedbacks on Amazon and similar sites. You can't always avoid problems, but it's worth a little due diligence. Amazon is the biggest and the most likely to have many comments and it allows you to go straight to the bad reviews and read through them. Sort by date so that you're starting with the most recent and hope to find 6 or more comments w/in the last year; older than that they mean much less because things change... What you're looking for is multiple reports of the same or very similar problem - that is your red flag. Then you decide whether you time is worth taking a risk on that product.
Amazon and similar large sites are good for another reason - enough
problems with a product and they won't stock it. That takes a year or more, but it helps a little. Another thing to look for, on Amazon at least, is the actual seller. If it's Amazon it means that they have found that product to be worth their handling it, to not cause a lot of problems. They keep the gloves on and the name off for the hundreds of vendors listing on their site but selling from other sources.