In a very hot chase where two planes are mid-ranges apart(400~600 yards), and the chased plane is slowly extending away, whether the guy behind you is using tracers on or off, makes a lot of difference.
If the guy behind me is not shooting, I try to extend away as far and as fast as I could - since he ain't shooting, I'd like max acceleration without any movements.
If he is shooting, then I'll have to extend, trying to jink at the same time. Which, puts me into the risk of being caught up.
Now, if the guy behind me has tracers off, and spewing bullets like raindrops in Florida squall, then things become ugly. It's a good trick no doubt, but personally, I hate that one. (which probably means, it's effective)
Not to mention the fact, that I hate being shot at over 500 yards distance, in the first place, and I also hate that there's a very high possibility of being shot down from such mid/long range spraying, in the second place(I just hope AH2 will bring some difference in mid/long range gunnery - in other words, I hope ppl can't hit jackshi* over 400 yards)
Luckily, recent AH1 changes where we can see the gun flashing, helped a lot. If indeed, engaged in a hot chase with the distances as such, the gun flashes are visible to the eye, which really helps spoil the "come on, I have no tracers, so straighten out thinking that I'm not shooting, while I spray these dweebey allied weapons at you" tactic.