I received this quad yesterday and so far I am really pleased with it. I am coming from a beginner point of view so I haven't got into all of the tuning and I have noticed that it is very twitchy and feels quite powerful compared to the toy quads that I have previously been playing with like the Hubsan H107D.
I am disappointed to here that its lacking but the reason that I got this one opposed to another like the qx95 etc is that I had bought the newer Flysky FS-I6s transmitter and it turns out that it does not support the older AFHDS protocol which is the only option on all of the QX series micro quads. This is the first model that supports AFHDS 2A and so it was the only real choiuce for a pre-built micro.
I am keeping a journal of my experiences with the Eachine QX105 as I lean about it, which might be useful to other beginners.
Thanks for your review - It has showed me a lot about things to consider and options for tweaking the setup. I hope you keep adding to it and write more3 for the upcoming quads.