Honestly I want to have way more plants before selling any division... I intend to use it for breeding, as I have a couple other roths that can be paired, and Mt Millais as a pod parent gave much better result than as pollen parent
As a pollen parent, quite a bit of the progeny is excellent, as a pod parent, nearly all the seedlings are good, like Mt Millais x Nan Chou, Mt Millais x Val ( that gave most of the GM roths from the TON, the Val x Mt Millais being very good too, but with a lower percentage of excellent ones), the Lady Isable from the Eric Young (unsurpassed as of today, even if the stonei was low quality, but Mt Millais was the pod parent), the Gloria Naugle from EYOF and its crazy hybrid with vietnamense, etc...
About Tarentula, and the other awarded roths, they are amazing, BUT in fact they are improved Mt Millais, not really something 'brand new'. I found even the key to the improvement. Mt Millais has thin roots, and lighter color leaves. It can make flowers up to 34cm, petals 2.2cm ( that's what I got, so I imagine they can be wider on an older plant...), and a dorsal that is similar to most if not all modern FCC/GM roths. There are really few FCC roths if any that are superior in sizes IF Mt Millais is grown in rockwool (or orchiata, but with very careful feeding...).
When bred with Val, it makes seedlings that have a kind of hybrid vigor. The root system, like for Tarentula, is stronger, leaves are darker green (similar to Val). They can grow traditionally to have flowers up to 30-32 cm. With meikakke and some other culture skills, the flowers can reach 38-40cm.
I think in rockwool such a plant can go over 45cm flowerspan. On the other side, I was interested in Tarentula and others GM roths for the 'prestige'.
Mt Millais is the plant behind all of that, Val or Rex are in fact not so good and not so nice, they were only growth boosters, and eventually correcting one very minor defect of Mt Millais ( the slightly pinched dorsal, but I like it...). In fact Rex washed out the color in most of its progeny...
For fun, the TON offered to me Rex 3 mature growths and starts for I think 2000USD if I remember correctly...
When using Dou Fong, a vini roth, or a 40cm naturally flowered jungle roth (got two different, soon three...), as a pollen parent, the progeny will be superior, so I just have to be patient to get the next roth standard ( and maybe AQ hehe...).
I am doing as well a lot of primaries, there are quite a few seed caps on the way already, and the germination rate of the first ones is pretty impressive.
The selfing has been harvested and took two weeks to germinate. I will make tetraploids out of those only, to keep the EYOF tradition alive ( they did 4n counted roth, that were absolutely amazing..., selfings of Mt Millais).