it took me a while but i found that thread talking about the flat rap lip issues. i already had linked it to the qj site at some point apparently...
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as for the rattles, i personally like them. i like the rattle in the trolls to series the best, on the smaller size with a nice little 'ping' noise. the rattles in x raps are too big and too clumsy for my taste.

also from my info gathered on what caught fish and what didnt, 80% of the fish we caught were on lures with rattles. but that doesnt mean overly much as most of the lures we do troll have rattles. only one guy in our group trolls a rattle-less crank frequently, a silver/black fat rap, and that lure is tied for 2nd most fish caught. but again, skewed because its almost the only lure he does troll, so it sees the most time in the water. which takes us back to (i think snow_dogs) the point that the lure thats in the water most catches the most fish!