You heard wrong, I have a max dmg storm bow so i know. It is basically the 'coolest' looking bow in many peoples opinions including my selfs and it just is.
Stats of it are, it has exactly the same range as a long bow... but fires a bit faster than it. Basically it could be considored the best bow in the game for overall stats and kind of rules out using a long/flat bow because of its faster rate and equal distance.
I'm not saying it's a good short range bow though... halfmoon/short kick its @$$ with their ROF... but it certainly is the best long range bow.
As for eternal, i have never used one but i've heard the stats are very similar to the Storms! (but nothing looks as good as the storm

)