If you master FFF and banked 'real' turns that look like a real heli turns when moving forward (ie smooth) then I feel this will help you greatly re flying method and thumb memory. Going from a 50 sized nitro heli to a trainer was pretty easy, just took a few circuits to get used to the feel, then it was onwards and upwards.
That said, I don't know how the lack of weight and drift that see on those micro helis will feel. I started on a 450 sized CP electric heli, and moving onto something much bigger (my nitro weighs 3.6kg/7.26lb when flying) added a whole differing feel that was totally new to me, and in fairness, I'm not too sure how I'd have gone going from the lightweight 450 to my old trainer as there would be such a huge change in feel and way it flys over the old 450.