Given how notorious the Chinese government is in forcing local companies to add spyware to their products or store encrypted data for future decryption when quantum computers will become more feasible (e.g. Huawei), how secure do you think their Terramaster NAS products are? Is it worth the cost or is it best to just steer clear of these?
Having recently purchased a really nice looking piece of network gear with all the features I wanted at a very low price from a Chinese vendor that had absolutely no existing reputation I was aware of, my experience was enlightening with the final lesson being re-taught: you get what you pay for.
If your use case is within the boundaries of the equipment’s quality limits then you will probably do fine, but I suspect if you try to explore the more complex features of the equipment you will find out where the lack of effort and cost reduction comes from.
I don’t think this would be any less secure than any other consumer vendor device. I just don’t think you’d be able to get much help if anything is broken, and I wouldn’t expect to see any fixes for bugs.
You definitely should not put something like this directly on the Internet, and that advice isn’t limited to Chinese hardware. It is pretty easy to limit a device like this from “phoning home” at your Internet edge if you’re concerned with such things.