After reading the reviews here, and seeing that there's a Wordpress plugin, I decided to take the plunge and buy the 4th Tier since a lifetime deal seems like a good bargain. I'm running my first of 8 sites -- it's a niche news site that's been around for over 15 years and has thousands of articles. ClickRank just finished scanning it and is now busy fixing stuff from 10, 12, 15 years ago. There weren't many errors from the last year or so because I'm always trying to adjust with the times, but I have not had time to go to years-old posts and fix them. I'm loving watching ClickRank go through and effortlessly clean up those old, obsolete issues.

ClickRank is super easy to use. Given that SEO changes so dramatically over the years, this is a fantastic service and worth every cent in terms of time saved.

I have no idea if there will be any appreciable difference in site ranking, but some of the fixes alone are well worth it.