If your after a wide-angle lens for your nikon, you can't go wrong with this for the price. The one thing which I will say is set your lens to 20mm otherwise you'll lose the picture in each corner at 18mm not by much but you can see it.
This lens accessory will compliment your kit lens, if your into landscapes it's perfect for the price. I've even tried a 52mm cir-polarising filter between the wide-angle and kit lens and it works a treat, as you can get a frim grip on the lens to turn the filter. If you just want the wide-angle lens on with out the marco filter you will need to but a ring converter with male threads on both ends as it won't screw into the kit lens as they are both female threads.
I would recomend this to any budding photographer if they are just starting out.