Not intending for this to be a Festool commercial, but , you really do get what you pay for. Most bits are cheaply made and many drivers have poor retention so a crappy bit wobbles in a crappy driver. Not a recipe for success.
I know someone will scream due to the cost... but
Since I've been using the Festool bits with their drill/driver, I no longer look at them as consumables. Used properly, they last. I bought the installers kit several years ago, and haven't replaced any of them yet.
While we're on it, the Festool Centrotec system is just fantastic. While we're on that, their drill/drivers are great as well