Net experience with AliExpress has been very positive.
My first 300T from them arrived with some shipping damage, which I was able to fix myself, though it left one of the pot supports pivoting a bit stiffly, and not quite clearing the valve handle. (See post above, ~ 04/09). I emailed them, suggesting they might want to use a stronger shipping container, but that my stove was functional. They responded by offering to send another stove, which they have done. Can't ask for better service than that.
Also purchased a 116T, which seems also excellent, though different. It's slightly heavier, as noted in Roger's excellent article, and might be optimized for larger pots-- its pot supports spread farther-- and greater heat-- the flame seems slightly more coherent at high output than it does with the 300T. On the other hand, the 300T's flame seems wonderfully stable at low output, and I don't imagine a better simmering stove exists.