Truthfully I haven’t taken the time to run Halcyon enough to really give it a fair shakedown. In my defense though, I got it a day or 2 after my daughter was born so my schedule has been less predictable than before, in terms of having uninterrupted hours in which I can listen to subs. 
I’ve got it in both Terminus and Terminus Squared strength, and I’ve been listening to the T2 version every Sunday and the Terminus version as often as I can throughout the rest of the week, typically every 2-3 days when I’ve got a chunk of time that I know won’t be interrupted.
I have seen a few examples that I think are attributable to specific modules, such as consciously noticing how pretty some light reflections in a puddle were, or actually really enjoying the stories I read my daughter. For those I would attribute Joie de vivre and/or ego adsum. My “panic responses” are much diminished compared to before, but overall I’m definitely not at the level of blissed out supreme confidence that I’d wish to be at. And I may never be, regardless of what I do… I’m a fairly high-strung person by nature… always have been, even as a little kid.
I’ve also been very confrontational lately… enough that I’m conspicuously being quiet in conference calls now, as I’ve been very vocally critical over the past 2-3 weeks… and while I believe I’m in the right, it certainly hasn’t won me any friends. In fact if anything it’s convinced people that I’m an unreasonable nitpicker… meanwhile all I wanted was for our new website to actually work, and now 3 weeks later among other things, we still can’t publish any new content and the button text on the main page is the same color as the button background… but I digress.
It’s definitely not focused on being a healing sub per se, especially not when compared to a beast like DR. It’s more of a mental strength sub, if that makes sense.
If you want to replicate Halcyon, go right ahead… I’m eager to hear what results you can get with it… also a bit stoked that someone would consider it a viable contender for Dragon Reborn. 
