While I will never buy a screen that isn't IPS for my computer, I question the necessity of it in this device.  IPS makes a great marketing point and will make it look really shiny during demos, but I think it is the wrong tech for this device for day to day use.  If I had to choose between colour accuracy and battery life, I'd much rather have the battery life.  It's not like I'm going to be editing photos for print on the iPad.