You won't see any difference on a laptop.
It's still a battery hog and cost a lot. Until the price goes down and the power issue is solved or given an alternative solution, Blu-Ray will not replace DVD. I can find a good Pioneer dvd writer drive for a PC for about 10 bucks on sale, 30-40 regular price. Blu-Ray? About 200 bucks total for a good quality drive is in order.