Part of my link development strategy is to try to keep an eye on my competitors and I have been using SEO Spyglass for this purpose. It gives an analysys of your own or competitors links showing anchor text PR of links etc etc. I have found this useful in terms of building my link campaign because if the reports are correct it tells you how many links you should need to overcome a competitor in the SERP. My question here for the more experinced is How accurate is this tool ? have you used it and what is your opinion on its effectiveness ? Is there a better tool that I can use ?