The HD is Much brighter in direct sun light and you can see it very well. I have a 998HD that sits right next to a 858c DI that is not HD and i can tell the difference very easily. To be honest if i had the cash I would go HD but is there is no way to swing the extra $400 bucks I would get the older version........or just wait and they all will go on sale at HUGE discounts later this fall.