I know 3 long times members of the large edf community who have bought fans from you that were Extreme disappointments. None lived up to the promised performance and one was unusable (not balanced properly).
That's the reputation that you have with those I know.

The reason that I prefer the Dynamax over the Ramtec is that it's an easier conversion. At power levels below about 8kw is can be easily done with off the shelf parts. Also all parts are interchangeable. The Ramtec has 3 different blade types and at least 2 different diameters. That alone was a big negative for me.

BTW you've been using the "waiting on an SHV esc" excuse for years now. Hint....Flier Models. They've been selling good shv esc for years. Are you waiting for the AUD to appreciate so that you can afford one? That will be a long wait. Iron ore and wool just won't buy what they used to. LOL