Re: First I heard of these
but I have never heard of the brand or phone.
Sounds like you're a gift to marketeers everywhere. There's plenty of makes of phone that have little or no brand presence in Western markets, offer comparable or better specifications and much better value. There's some stonking good devices at bargain prices, particularly in the mid-market. Consider names like Oppo, Vivo, Xiaomi, Meizu, Elephone, etc etc. The website techadvisor.co.uk does a nice niche line in reviewing some of these.
You can buy as a personal import (so do your research, set it up yourself, wait for delivery, pay the import duties), or in several cases there's small UK based importers bringing them in, configuring them, and selling via Ebay, in which case you pay a bit more, but it works out of the box, arrives quickly, you don't have any import duty concerns, and you are protected by Ebay, Paypal guarantees, by UK consumer law, and (depending on how you pay) by the Consumer Credit Act.
I'm running a Xiaomi and it is a really, really good phone. Anybody who is thinking about buying the expensive brands being promoted in the UK and EU should check that they really are getting something extra for the money (and maybe they do, but they should make sure they know what that extra is). There's little wrong with most products of the big brands - its just that those companies have to recover the high costs of UK branding, promotion, an official presence and head office, a sales force, "bribes" to MNOs, they tend to be corporations with higher overheads, and often they are exploiting a UK willingness to pay high prices via regional pricing, or models that are "only available in the UK/EU".