I gave this technique an attempt today and have a few notes - mostly positive
1. This is a time consuming way to set up your dab. If you have immediate medical needs that are likely to come up - have two enails. One always ready for a dab at a stable temp and another at the ready for uptemp dabbing. I can say with almost certainty that d-nail will release new controllers that incorporate this kind of functionality into pre-defined settings that take care of the work. Still, not hard to get the hang of overall.
2. The flavor is fucking out of this world! The start of the medium sized 5 star full melt that I dabbed was the most intense lemon candy like flavor I've ever had. This isn't the same as start-of-ultra-low-temp-vapexnail flavor, it's much better still!
The dab was less harsh overall no doubt because terpenes at the beginning of the dab were more gently vaporized at the super low temp, instead of violently decomposing and degrading at temps far beyond their respective boiling points. The end of the hit tasted like your typical aged but still high quality hashy taste. Very pleasant and enjoyable - not like that generic overcooked errl taste you get from other dabs. I will try this with some rosin soon to see if the end of the hit gets any of this aspect.
3. The rise in temp made the dab vaporize so much more effectively and for for full melt (which requires a little longer to fully vaporize than oil) the rising temp towards the end was very beneficial. I felt like there was absolutely no wastage this way.
4. I qtipped very late when the nail was very low temp, it still came up just as clean. I turned off my enail when it hit 600 on the dial because the dab was finished, although I had it set at 800 or so.
All in all, this will be game changing when it is incorporated into a fool-proof factory preset function of next-gen controllers. For now, it is great for the best of your dabs, the ones that are too good to 'waste to taste' and too tasty to hit at high temps to ensure full vaporization. If you have quartz especially, I recommend this technique.
Reading the notes, it does not seem ideal for SiC (very different behavior with heat vs other materials is the culprit) and it is great on sapphire (I used the sapphire halo), but I would be very careful and only use the heat retainer between the coil and dish as they suggest for sapphire.