I brought the action cam 3 to use while riding my supermoto I wasn't sure what to expect for £40. It also comes with various straps etc. Some of you will be aware that the single cylinder supermoto's vibrate like mad. I tried the handlebar mount but it made the vid wavy, i am sure it would work on a pushbike and possibly other motorbikes but not the supermoto. (TIP) I cut the loop off the handle bar mount and fixed the mount to my visor screw, works a treat ;)
Helmet strap: Not much good for my type of helmet as were the cam is needed the strap would have to go across my visor.
Velcro: Included is also a sticky velcro pad, seems very strong and should hold the cam easily, i wouldn't stick it to my helmet.
I have tested the cam on a ride out and the overall quality is good in day time recording.
Sound: Very good sound quality until i got to about 20mph (TIP) Cover the mic hole on the cam with something, i used spongy tape. Covering the mic will stop the wind noise but engine sound and voice can still be recorded ;)
Overall a great little cam for the money. To see the quality of this cam look on youtube.