i got beta and nothing happend. I would definatly get it because there is a lot of bugs with the new parts and the more voices the better

i dont think anyone has lost their planes or anything. i havent. you shoulkd download it.

If you do get the beta just make sure all mods are off, and just to be save and if you want you can back up current builds on the website.
I haven't had any problems with my builds.