just bought a
crystalsky 5.5 a week ago.
im in the eu, so prices are a bit higher here in general... but i was about find a barely used one on ebay for about 350.
using it with my
m2p with the official mount, had to order a couple of adapters off banggood.com to make the mount fit.
its nice. but be aware, there are a couple of issues with it in general...
a) rarely but sometimes, the video feed will be a bit choppy. a restart of the go app fixes it every time.
b) the processor is a bit dated so it can only do 720p live feed... not an issue really on the 5.5 inch but something to keep in mind.
c) the compass doesnt quite work, so in the sport mode using the 'ball' to know if you are pointed at the bird is a bit useless as it jumps around (known issue, my understanding is they all have this issue).
d) it is a bit heavy. nothing drastic but the additional weight is noticable.
e) it is bright. brightner then any mobile device i have tried... but its not shockingly bright. the
smart controller uses the same screen so i guess i would say the same about that. frankly, so far nothing beats using the
goggles. big huge high resolution screen with movie theater like brightness.
but generally i am happy with it. i had / have the option of sending it back (ebay returns and all that), but decided to keep it. the cost was not a deciding factor for what its worth. it beats my higher end android and iphone in pretty much all regards.