Having been around the block when it comes to getting marketing done online I've used their website a fair bunch when looking to connect my clients with a great SEO company. I've used TopSEOs as a resource since around 2007 and it has always given me a good idea of who is doing well and who offers the best value at any given time. Given how much the SEO industry changes over time at the whim of Google, they have helped me stay up to date on who can actually achieve the results and which companies fall off the board over time. What worked two years ago is outdated at this point.