To my ears, there are many similarities with the IE 600 in terms of shape, presence, and balance, with a hint of IE 300 in there. The TrueResponse DNA is strong!
I'll echo the above but say that the 600 and 900 have that "extra gear" of detail retrieval. Someone comparing the 600 and the 200 will hear both the similarities and differences, and probably find a slot for both in their rotation.
Absolutely smoother. The dual staging of the ear tips opens up some additional possibilities. Versus the 300 it will come across as more relaxed. Versus the 600 perhaps a bit warmer but very similar... Once again it straddles the line between engaging and non-fatiguing.
You are correct that it does not exceed the 600, and was not designed to. However, this is a gateway product. We want others to join this great hobby and you can't convince them that the journey is worth it unless they start off with an immediate reward. I think it will be a daily driver for some, a backup for others who maybe do not want to take a 600 or 900 on a 2-month backpacking trip, and for many will be the first serious in-ear to compliment their over-ear collection. I think it will have a similar affect that the 5x5 (and 5x8, 5x9) series had.
"Same" is a slippery slope especially as it comes to graphs. There's a lot of shared DNA but there are so many variables and ways to achieve a final sound beyond the driver. We are definitely proud of the driver and love its flexibility however it is not the "same" as the 600 or 900 or even the 300. For example the IE 900 voicing is noticeably different, and then you have The implementation of frequency absorbers and acoustic vortex milled into the earpiece which is highly complex and intensive. We do hope you hear the shared elements though, because it gives you a good idea of what it is capable of as you go higher up the chain. All that said I agree with your comment "it's not unreasonable..." as the team has worked hard to establish a "house IE sound". I'm excited for you to hear it so that you can connect the dots.