Well I have an A6 plant on my Python and have no issues with it. Other ships (the ones I'm used to) have much much MUCH higher power problems with their maximum power plant. So this feels like holiday to me. Almost no power management needed and still can use everything.
The only difference I noticed regarding weight is the acceleration and stopping and I did my tests with and without 250t of cargo.
No noticable difference in turn rate....
Biggest difference I noticed is in the FA-off 180-degree flick. Too heavy and it's all over the place. The 7A plant made me go crazy with equipment and when it finally came to pew-pew I was in for a nasty surprise
_
edit: Here be my PvE / missions Python.
Just bought A7 powerplant yesterday myself, upgrading from B7... Well, it's better. Much-much better - feel is completely different, I even think the boost is recharging faster, etc. I am not even talking about 30MW of power itself which is really, really good.
I was flying with B7 for ages, now that I bought A7 - 100% well money spent.