My GoPro is fine on my helmet up to about 75mph. If the headwind is really strong, I feel the helmet start to tug in that direction.
The one thing I do like about the GoPro is the durability. Those suckers can take a beating (ask the one that took a dive at 80mph at the track after I wrecked).
My first gopro died for no reason. It literally sat for 6 months then decided it wouldn't do shit for me. And of course being 3 days out of warranty gopro told me to get bent. My biggest bitch about the gopro is the freaking rattle. I want to hear the engine and me screaming WEEEEEEE, not CLACK CLACK CLACK as I sail through the whoops section. The tradeoff with the contours I run is the wind noise. Even with the silly furr wind screen I bought the audio is mostly wind. One could argue "get an external mic". Yeah, well... if I ran in clean/dry conditions all the time I would. I'm not about to open up any of my cameras for mods like that. #1 voids warranty, #2 destroys water resistance.
Get a contour for the lid, it's much more flushed vs a gopro. If you can find a roam2 they should be in the ballpark of $100-120. Mine flew off at the track rolled around several times and still works.
New Roam2s are still in the $200 ballpark. Roams, believe it or not, run about the same. The good news is, converting a roam to a roam2 is just a firmware flash away!
I know nobody asked, but I'm going to say it anyway.
I like my gopro black because 240fps allows for some cool crap. The ability to change settings on the fly (either from the terrible push buttons, or the so-so app) is a nice feature. Unfortunately they are a PITA to manipulate on the fly.
The contours ease of use when mounted on the helmet makes it great. If I have any doubts if I am recording, a quick placement of the hand lets me know where I stand. Good luck getting that with a gopro.
contours also let you rotate the lens 90 degrees either direction of center, and has a laser guide. Saves a lot of guess work...and makes for a bad data day when you discover everything was shot "tall lense" instead of "wide lense"