Hello Rich,
I've been flying the Adverrun in more than 1200 flights for 4 years now and am absolutely convinced of it.
(In the meantime is the Adverrun also the choice of the WC-Champion and conquers Japan ....)
The drive runs absolutely cold with the Kontronik; This allows training flights even at over 30 degrees outside temperature without any break (only necessary for the pilot ....)
My power consumption is with the Alchemy, battery Hacker Eco X 4600 mAh, Props Falcon 22 x20 / 22x22 in the P 19 (even in storm with wind around the 45 km / h) never over 3200 mAh and in F 19 never over 3800 mAh) and I fly "European" big and use the 8 minutes!
Once I had to extend and maintain an Adverrun after more than 500 flights (!!); the front bearing was knocked out. Otherwise only fly, fly, .... and no maintenance!
For more than a year I fly the new lapped gear-version; which has a really very pleasant noice and such an enormous power, that I have the possible max. power even throttled.
This always gives me the feeling of having enough power, even with " unflyable " wind.
A disadvantage of the rigidly "connected" two props I really could not find in practice. Since you heard at the beginning of all sorts of concerns ......
All "rumors" that I think come from people who have not flown Adverrun or represent any other interests.
As ESC, I fly light the Sinus ESC by Adam Debowski with very good results, but the Hacker Mezon 90 is also a very good choice and is always enough. (Hackers only gives the recommendation in combination with the Q 80 to take a Mezon 130 ...).
Because I am convinced, there is no alternative for me:
The Alchemy and the Adverrun are a dream combo!

best regards
Bruno Schiffler /Germany