Hey guys I am looking to take my OSMO mobile on some roller coasters in a few weeks and wanted to know your thoughts. Do you think it will be safe or do you think its a bad idea? Let me know. Thanks a ton.

Won't know until you try!  LOL, but on a serious note I'd say at minimum definitely have a secure wrist strap of sorts... I don't personally see the crew allowing you to carry it on, but if they do, at least the strap will help if your hand slips.

I have the OSMO Chest mount, and that would certainly keep the device securly connected to you during the ride. http://store.dji.com/product/osmo-chest-strap-mount

I was more referring to if my iPhone would be safe in the osmo. I am defiantly have a wrist strap on for the osmo.