I've tested quite a few guest posting services to develop my internal linking processes and I can very confidently say that nobody is even close to Kosta's service. Link delivery is always on time, the guest post quality is phenomenal, all links are posted on quality websites and the team at QGP always over-delivers. The reality is, if you really care about your SEO, choosing QGP will be the smartest decision you will make. This comes from someone who has 4 years of experience in the industry. Believe me, the only problem you'll have is that you didn't order more. I'm a customer for life.