Yes, it's always good to share knowledge!
Don't set your expectations too high! This is not an acoustic instrument, and the academic and technical understanding of what makes the sound of an instrument so unique to its performer is nowhere near complete. So it won't be at the level of a sax, but we feel the Sylphyo still has something special in this regard and we're working towards making our internal sounds even more unique and versatile. Certainly, we're already amazed when we see other artists appropriate some of our sounds and make them sound veeery different just because they are different persons. It also depends on the sounds, some are more "fixed" and others are designed to be more "versatile". Personally, I find that it's very easy with the Sylphyo to incorporate the different ways to articulate and modulate sound into my playing (vibratos, tonguing techniques, bends, etc.). And if you pair the many expressive controls of the Sylphyo with an awesome physical modelling synth like Respiro, well, that's a killer match!
As for the fingerings, if you come from the saxophone, you'll find that there'll be a period of learning to compensate for the missing keys. It's something we want to address (e.g., making a B flat by half-fingering the B key or by fingering the B key and half-fingering the A key as you suggested; or having alternatives for the palm keys) but we're not there yet (we're very open to discuss the fingerings with users). If you have experience with other wind instruments you might want to try the different adaptations we made for their fingerings, and select the one you're the most familiar with.
We don't have many Linux users, and we don't officially support Linux as a platform (it might be a problem for applying updates, though they work great in a Windows VM), but the Sylphyo and Link are USB-MIDI class compliant so everything will work great with your existing stuff. Please feel free to report on your experiences with Linux!