hacko's services are best. I already purchased his already ranked amazon site and also tried his new keyword service. I have published a article today for a "best" term and it has ranked on page 1 at #7 within hours so thats the magic of this service. He will provide you with super profitable and low comp kw in your niche so go for it and expand your site with this magic keywords. 10/10 for the kw service and hacko. Highly recommended.