Hey pal, you know my opinion and theory about fast trainers.
But as I said in that post http://forum.topeleven.com/top-eleve...ad-player.html fast trainer (or expensive player) and good player are different things.

Scouts for example have medium value price but all the players I bought from scout list were good.
4 so far : DL/DC (defensive wall), MC (f-k specialist), DC/DMC (Header), MC (specialist) , all youngs, 22-23 y.o. and with q4 or q9.
Also some veterans x-scouts and medium value veterans I had were performing good.

The fast trainers have the advantage that can have bigger quality (faster and with less sources) than other players. Also they can last longer in high quality.
As about performance / rates of the players, this season I 'm starting to believe in a theory little different (at least for my team).