So I have a pair of these for almost four months and I've been seriously listening to it for roughly one week or so. What I did was created a custom EQ comparing the frequency response they provided on their website and the Harman target (ie 2017). I'm using a Hifiman DAC + Amp setup.
To be honest I enjoyed these very much. Soundstage is great, resolution is definitely there but compared to over ear headphones (I'm using Hifiman HE1000 V2 & BD DT770 Pro 80 Ohms) there's definitely a gap.
And about that switch. I honestly didn't play much about it, I would say there's a subtle difference but again with my EQ setup I'd prefer to have better resolution and tune the frequency response to my liking.
All in all, I would definitely keep these around. They're great additions to the collection. For roughly $125 you get a IEM of great value.