Line Array Speaker vs Point Source Speaker

I have heard excellent line arrays, but one respected engineer has told me that arrays have different arrival times, since the drivers are different distances from the listener, and thus could not recommend them. I have seen a curved line array online that solved the distance issue, but I can't seem to find a link.

Here is a an interesting discussion on line arrays.

http://www.diyaudio.com/forums/multi-way/17948-line-source-speaker.html