I do like the design of this. Would be nice to know who makes the ink refills and bits. As is, I would probably get my own refills and use spare bits that I already know are good, like Wiha bits. If the quality of the bits were a known variable, it would be easier to justify. $50 far a nice handle design isn't completely unreasonable, but it's still a bit much for what you're getting. Really seems like most of the cost is going towards the novel design.
My most commonly used bit sizes are T6, T8, and T10, so I'd probably have to replace them regardless. Would be nice to either have different bit selections or have an option to purchase without bits at a reduced price.
Side note: the description says it takes "D2" refills, which I'm assuming is a typo.