I've been a huge fan of the Miura VS the last year or so and just burned through my 2nd pair when the Otaki came out. The technical specs of these shoes looked very similar (same last, same 1.1mm P3 midsole, same 4mm XS edge rubber) so I gave them a try.
Overall they are indeed very similar feeling shoes, with the Otaki's being slightly less asymmetrical and slightly wider in the toe box. What this equates to is a much more comfortable shoe, especially if you have a wider forefoot like me, with maybe a very small loss in power under the big toe, if any at all. Actually, I feel a bit more comfortable using the outside edge of the Otaki than the highly asymmetrical Miura VS which keeps me on the very point of the shoe 99% of the time.
The new "S-Heel" technology is not a gimmick, it really is probably the most solid feeling heel cup of any shoe I've worn, even on a pair of shoes that are probably a half size too large for me (I sized the same as my Miura VS and they seem to run a bit large. But I compared them to the same size Miura VS in the store and they looked identical, so I think La Sportiva sizing may have changed in the Miura VS as well).
I also like not having the 3rd velcro strap that the Miura VS has which hangs up in cracks and pockets and seems to be the first thing to wear out.
The only real issue I had with the Otaki's so far was a "hot spot" on the back of my left heel which gave me a pretty bad blister. I taped that area up for the rest of the break-in period and it is much better now, but this is not an issue I've had with any other shoes before. I'm not sure if its the design of the Otaki or that I just got unlucky with this particular pair.
Oh, one last thing... the Otaki "shoe-farts" more than any shoe I've worn, so if that sort of thing bothers you, look elsewhere haha.