Its a great tool with much misunderstanding. Trying to use it on a search results page will make it send about 20 different information request per site link on the search page. That's hundreds of request. Of course that will get your ip blocked from Google if your browser don't have a heart attack first.
Use it on one page at a time on the search leading sites and your fine. It will give your great insight on what SEO methods work for leading sites and how they work on each search engine.
I am sorry folks, that's really powerful information and that makes this tool critical to have if your an SEO player. For those that understand what this tools does and how to use it carefully they understand the developer need not be polite.
You can compare the data from winning sites to your sites and make the changes to perform much better in search results.
Many AdSense users are angry at the Adspy feature as it gives you the AdSense id number of every web page using AdSense and with that you can see all the sites one owner has and study how he is making money with PPC site networks. Find a good one and you can follow the leader and make money off ads. The thinbg is anyone can get the id by looking at the view page source. All this does is make it easy.
They do track you but no more than any big name site and nothing to get nuts about. Nobody cares about where you go online but where groups go so its not personal information.
It does violate Google terms but if used properly it won't trip the IP block filter. The ip ban last a few minutes and your right back. Just don't use it on search results pages and don't get banned to much or they may boot you and all your sites from all Google services. Use common sense and you have a powerful tools to help you do as the winners do. The winners don't like it when their money making secret gets out but that's the way it goes online. If your making money online copy cats will come and unless you have a legal right to exclusive pay per click network site arrays and strategies anyone can copy you legally.
This is a good tool with developers who are like most developers, they have a hard time explaining things to non geeks and get offended when your lack of geek makes their work look bad.
Hey guys, 3 words, public relations representative .