I stayed at Delta Motel in April 2014, just for one night. The price for one single room was approx. 130-160 RM, breakfast included. The motel is located right by the beach but this part of the beach isn't that clean. The room was on the ground floor and in poor shape. I'm not sure that the sheets were clean and that the room had been properly cleaned. The breakfast consisted of tea, coffee, juice, toast with butter and some kind of "strawberry jelly" (really disgusting). There was also rice. I was quite reluctant to eat due to the hygiene of the restaurant and I would not consider eating any other meal there.
I would not recommend Delta Motel. There are far better motels and guest houses with a better location and cleanliness for the same price. In general, my impression of Langkawi is that the price for hotel/motel/guest houses are higher but the standard is lower than other places in Malaysia.