Emotional wellbeing can be defined in different ways. Daniel Ingram (in the Guru Viking episode with Delson Armstrong) also relates Bill Hamilton's model where each path attainment reduces suffering by 20 percent, with death erradicating the last 20. Where he also says that for him (DI), he would rate 1st and 4th higher in reduction of suffering. See also the Guru Viking episode with Har Prakash Khalsa, long term student of Shinzen Young and teacher in his system, were he talks about what he uses as criteria to evaluate events happening to students. Where he says that the big, big thing he looks for after a possible SE is reduction in suffering. So the perceptual shifts really seem to do that for many practitioners.
Some aspect of stickyness of emotions gets reduced with each of these shifts, but they don't in themselves resolve the issues at the heart of, for example, attachment wounds, etc. Or if they do, it's by chance, not because that is what path attainments generally do. As Hamilton also writes, if I remember correctly.
Btw, Ingram also clearly defines path attainments in MCTB. It might help to read it more than once as we all have the tendecy to reduce a 600+ page book down to what stuck in our minds and what we could relate to.
For me, there was a noticeable increase in wellbeing that I would say was due to a reduction in sensory friction. As I model it, the path attainments basically increase bandwidth and detail resolution of attention/the phenomenal display at baseline, and the first upgrade in that respect brought a constant effortless apprehension of sensate flow in the body that often felt like being gently massaged, and an increased sense of spaciousness in the way perception worked or presented generally. That just felt better, significantly better. Being awake (Edit: In the conventional sense of not being asleep at night, of just walking around day to day baseline feeling tone) just felt good now, it was a process of sensate flow for parts of perception where before it was ALL solid and contracted. But there was also the interesting observation that yes, woo-hoo, major upgrade, but it seemed to really be "just" 20 percent. A significant first step, a deep appreciation that the techniques work, that the old Buddhists monks and nuns truly figured out something fundamental about how to work with this bodymind thing, but the increases in perceptual ability also hightlighted what remained unaffected by that perceptual shift. Now I was a fuck up with some meditation chops and some seemingly permanent perceptual upgrades. So far, so good.
The first days were also quite irritating for me, since it was a roller coaster of the new perceptual vista being hugely distracting (as it seemed back then) by virtue of it's new detail richness. "Hm. Seems like I'm not in the breezy EQ territory anymore..."
I started to notice cycling, in stark contrast to where there was none before. Suddenly feeling very up, then kinda languid, suddenly noticing some quick worst case scenario images flickering through in a way I never had before, things like that.
After a day or two I finally I sat my ass down and started working on review practice, immedately saw that meditation sits now started in a 2nd jhana/ A&P like buzz, I started to explore the stages, their vibratory signatures, eventually called them up out of order, started to get repeat unknowing events that checked many of the boxes of fruitions (Except clear three doors phenomenology. I never was able to make much progress there. My only quite clear entrance to fruition was the second path one, where that side colapsing into this side was the dominant aspect). To be able to get to these deeply refreshing mental resets was just great. These mainly happened on the cushion and during nap time (as I found out after reading the passage in MCTB2 that talks about that and playing with resolutions to have some while falling asleep). I only ever had two fruitions in daily life. I sometimes noticed that the system learned to go to fruition as a new way of recovery. I remember being super tired after a bad night's sleep, visiting my family, lying down for a nap and, without inclination to go there, unknowing event blips just started to happen on the verge of sleep. When I woke up half an hour later, I felt completey restored.
After SE, the visual field was different in a very... "luminosity" kinda way. In the early days, the first thing I would do upon waking up I was too look around to see if things still seemed more vivid, more present, more intrinsically aware, like they appeared over twenty years earlier, when the few times I took mushrooms or LSD, the drug would start to kick in. That was a very present thing after 1st path, the way the visual field was so much more immediate. It went away as a dominant aspect upon hitting 2nd, to come back at the next shift.
It also was stream entry, quite literally. Insight-itis. Now the only way out was through, no turning back possible. Practice made for further progress, and within weeks there was the feeling of reconsolidation, of having regressed, that announced the next layer of mind presenting itself. One day a sit went super buzzy jhanic and just wouldn't wind down for a long time. New A&P. And then the fractal mess of the next DN, where it sometimes seemed that some of the stages had micro stages, with an EQ-like fluxing out, some sort of blib, and then it was into more DN interestingness.
So, pretty much variations on a general theme that many technical practioners report.
Thank you Daniel and Shargrol for normalizing so much that occured on my journey, and for giving so many helpful navigation tips. After SE, Shargrol's Post Compilation, MCTB2 and the rapid fire round of Daniel Ingram's first Guru Viking interview became constant companions.
It really sucked. That all changed after first path and the intense negative episodes were as good as gone by third. 
