We have worked for hundreds of clients and have seen tremendous improvement in traffic and search engine position. Just like our other services, we have strict quality control in terms of selection of blogs for your website.
The pages all of us post comments in will be as appropriate (as it is possible) towards the key phrases you are searching to rate much higher to get. Each of the comments many of us write or place to niche specific blogs are going to be topically relevant. We will never post spammy plain looking comments.