What is your opinion about that Ohto Super Promecha, they look like they also have lead rotation like the Uni Kuru Toga right? Don't know that brand to be sincere.
The Super Promecha doesn't have lead rotation. What can be controlled is the amount of lead to be exposed with each clik, and the extension of the tip (tube lead protection). About this latest feature, only the oldest "S" series as a wheel up front to pre-select a fixed amount of tip exposure. The newest doesn't have that feature.
The currently available Promecha 500P has no selectors, the Promecha 1000P has only the basic feature of rotating the grabber to expose or protect the tip, as have all the Super Promecha, and the latest 1500P has the wheel above the grabber (middle of the body) to select the amount of lead to be dispensed with each click. I find this feature useful for thin leads as 0.3 or 0.4mm. I have a Staedtler REG 925-85 that has this feature also.
All this Promechas are made of aluminium. I don't like the 500P because it's to light weight for me, and love the 1000P because of the mass distribution towards the tip. It has a thick grabber and light body. The other Super Promecha because of the lead dispenser selector, are prone to body breakage if not cared (dropped or bent can ruin them). Though the tips of those mechanical pencil can be protected (500P excluded), and supposedly make then good for caring around or to be inside a shirt pocket without stabbing the owner, I wouldn't recommend them for that, because of all those "twist and turns" don't make them a very robust mechanical pencil.
But hey!... Someone that has a Rotring 600 should know that because of his weight, at the first fall, most likely the tip will be bent. Unless you place a foot under it to prevent a direct hit to the ground, and end up with a shoe pierced, a stabbed toe... and a 600 tip bent anyway.
A note about the lead holder you recommended for wood work: I highly subscribe the choice. First, the best option is to go for a thicker lead, or the lead will be breaking all the time. But the Staedtler model you recommend has a feature that distinguish it from the traditional lead holders. It wont free fall the lead at a click, like the traditional lead holders does. It behaves like a mechanical pencil, exposing a millimetre of lead with each click. I have one of those but find it very fancy for wood working, for me, so I use a Rotring Tikky 1mm. But if I was a Pro, I would go for that Staedtler 925-25 2mm
EDIT: I'm thinking now that the Promecha 500P 0.9mm could be an option for this also.