Same. I found this because I got my piano tuned yesterday and it bothers me it can't sound that wonderful every day - bothered me even more that it did not seem to exist as a commercial project or DIY solution. I'm in KC so might try to connect, maybe even get it for my Kawai!
Supposed to be able to install on any piano, and remove without any sort of permanent damage or anything, can see on this page https://dgdevices.com/gallery
Well never needed an unlocked bootloader specifically, but have found Swappa to be solid place to buy used gear more generally - purchased 4 used iPhones and 1 Macbook Air so far.
This is exactly how I would describe my experience. When I talk to others about polars now I usually quickly mention its fast up front, but then mostly talk about the API, its composability, small surface area, etc. are really what make it great to work with. Having these same semantics backed by eager execution, query optimized lazy API, streaming engine, GPU engine, and now distributed auto-magical ephemeral boxes in the sky engine just make it that much better of a tool.
Polars is awesome to use, would highly recommend. Single node it is excellent at saturating CPUs, if you need to distribute the work put it in a Ray Actor with some POLARS_MAX_THREADS applied depending on how much it saturates a single node.
I have spent probably over 100 hours now fiddling with data using polars and it is just so enjoyable to use. The interface is the real magic here.
This was captured well in their company announcement blogpost [0]:
> A strict, consistent and composable API. Polars gives you the hangover up front and fails fast, making it very suitable for writing correct data pipelines.