Never used a Syma X5, but I have a Hubsan h107c. Incredible and stable flying machine. But the L version is more agile and have longer flight time. No video, more fun!
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I think its very stable, even without software mods. But its a very good and and beautiful place to fly, lucky you! I had lost my first (good)quad in the second flight because there are only forest here... any fail and bye bye! And another one (a V949) dive in a river and recovered.
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