Oh I see. My purpleheart Milaana is a V2 custom (I asked RBT to give it a more standard tuning, but some others who got exotics with me had theirs tuned hot-- which is how my old V1 runs albeit with an unrefined build) so comparing that to my walnut II I can do! Only one in between the V2 and the II is the aforementioned 1.5 I believe, which I never had and there weren't too many made with a little variance in bodies.
So the II has a smaller air intake like the Splinters, though it is only one hole, so it is not as free flowing as the V2 Milaana with the air intake at the top next to the bowl with the screen covering it. Don't get me wrong though, airflow is still very open, this just helps regulate draw with a little more restriction. I'm still able to draw as fast or slow as I desire, it just is a little more mindless, and should be better for sharing (haven't gotten to test that yet). The only downside of the new intake, is that you need to be careful not to cover it with your finger in use, though if you have a weak battery doing that for the first couple seconds of your hit could help boost the heat.
I know my V2 was also more tame with the heater, due to its Amber glass, but I imagine the German clear glass in the II must be even thicker. My II heater does not feel tame, but perhaps easier to tame? I have overdone it a couple times, but no combustion (not using cooler stems, which could make it harder to sense by taste/heat I suppose, I did for one bowl with my custom Jr and it was quite nice n smooth though). Anyway this is what I mean by a refined build for the heater and tuning, it really feels like an even more finalized Milaana.
Finally, the physical stuff, RBT got his woodwork to an amazing level with the V2 as you can see by my purpleheart, so the II carries that on. It is slightly smaller, but boxier without the curved side and the squared off bottom. It does feel more secure to stand upright, though I still prefer to lie it on its side. I have not taken it out and about to use the safety pick yet, but it and the new copper look great. I also like the two tone look with a different wood for the bottom, love the redorange color of the sapele wood, and that unique grain!
So all around, more or less the same ol Milaana experience, just a bit more refined and evolved. I felt I need to have one in my collection, but from a performance standpoint you are not missing much at all if you already own one, especially one of the later versions like the V2.