im in the market for a new sight for one of my rifles and was wondeing what the difference is between the model(non-xlp model) that takes 2 AAA batteries and the one that takes 2 N 1.5 volt's. is one an older model and what are the differences in features. i can get the 2 AAA model for $225 and the other one is around $260. also how are the xlp's ive heard that the smaller windows make it tougher to get a good sight picture...