A word or warning. I have a pair of the 4000 XTFAs which have a similarly flimsy bail arm to the 4000d. I carry my rods on a quiver with the reels on - normal (fairly) rough usage - and the bail arms quickly bent so that the line no longer rests on the roller.
As these were under warranty i contacted Felindre to get the bail arms replaced but they refused saying it was my treatment of the reels that had caused the problem. They added that as they had next to no complaints from anyone with the same problem, they didn't see it as a design flaw.
The result? I am using 2 reels with damaged bail arms which are in too poor condition to sell. Frustrating, to say the least.
I should add that i have absolutely no axe to grind against Felindre or Shimano - in fact i have about a dozen shimano reels.