Wow, that’s an awesome endorsement and I certainly like that you can save the battery while doing your predive prep the night before.
When Miso upgraded to the v5 (I have two v4's) he made battery changes so much easier, no more fiddling with screws! I have been using the nauticam valve now for 8 months and prefer the fact that with the leak sentinal it is all integrated. I dive every Sunday morning and quite often don't return home until the end of the day. The switch for Nauticam vacuum is inside the housing - with the leak sentinal I would prepare the housing the evening before, pull the vacuum and leave it overnight using the overnight function. Before heading out to dive, an hour before, switch back on and the vacuum is measured straight away. Complete the dive and turn off the unit. Rinse off and then bring home many hours later for a thorough soaking. With the nauticam - if you want to prepare the night before then battery will be on until you finish the dive and open the housing again.
Batteries are cheap- but once I seal my housing I don't like to have to open again until the dive is complete - owning two long haired cats makes me VERY cautious with inspection of the o-rings !! Having flooded a camera due to a stray cat hair a few years ago I won't get in the water with my camera now unless the vacuum seal is green!! Better to be safe!
If you need anymore info I would be happy to pass on contact details etc. Miso is one of those gentleman in the underwater photography world - he has a product that works, backed up with impeccable service, good price and a can do attitude that is second to none. At least that has been my experience having used two v 3 which I then upgraded to v4. If I did not have the nauticam valve I would get the v5 with no hesitation. Miso even supplied me with spare parts, batteries etc at the outset recognising that it is difficult for me to source u/w gear in Vanuatu! That is service.