[Daren]

Like dirtclod said it is going to discolor pretty quick unless you live far north where the weather is already cooling off. If you do any turning or have any turner friends that could be a good thing, if you have room stick a few of the logs in the shade someplace and next year you could have some neat looking spalt.

The guy you talked to about having them milled told you right, that short they would be hard to mill. Not impossible just time consuming, time=$. If you have/have access to a larger upright shop bandsaw or chainsaw mill like was mentioned, hackberry poses no out of the ordinary drying problems as far a movement. It will sticker stain like maple if you don't have good air movement around/through the stack though.