The Gearbest item is only 32Gb storage, I think ... not 64Gb.
Slightly cheaper from Gearbest @ £72 https://www.gearbest.com/cell-phones/pp_1814506.html?wid=1433363
Bargain price for the spec at only £76, Just bear in mind that these LeEco phones have been plagued with software/hardware/malware issues, so do read up on the issues first. Personally, I'd a Xiaomi for this sort of price. Established trusted manufacturer with reliable hardware and good software / support / big userbase.
It's testament to the quality of these phones that they're still highly considered and good value, two and half years after release (April 2016!).
Looks like it, and also seems to have some support and a few other ROMs on the XDA forum. That should take care of concerns on the stock ROM, if you're able to install one of the alternatives.