No the osmo is not a must have. I have has one for quite a while and i wish i just had boughht a canon dslr. THe osmo has some really wied tendencies and i find myself constanly having to recenter the gimbal. as far as im concerned it should always do that. As a vlogging tool, it would drive me crazy. you pout it into selfie mode and the camera faces towards the operator. if you move around at all or spin with it in front, the camera is always lagging way behind and you always loose yourself in the shot. And finally its too **** slow for setup. I take mine dirt biking and hiking and all sorts and it just find it to be a pain to pull it out turn it on, then the wifi takes forever to link to your phone, and then takes some more time to link to phone then you finally have it and the shot is gone.
Dont get me wrong. it has its time and place and is a great tool for filmmakers but I would absolutely us a dslr way more than my oso