I have heard of them, but I never used them istead that I would use this site,I mean I used it..it cost like $20 and I think with that subscription you get an ebook..at least I got it in that time..its really nice ebook..and it makes kind of everything automated(their service)..you have control over rejectind and aproving links thats so important dont you think? and after a while you can just simply cancel subscription and you still gonna have everything..all links..dont you think it would be much smarter move then use linkmasters..Check it out www.linkmetro.com
I've just taken a look, and here's what I think: Personally, I would never use a link exchange network like this. In my experience, most sites that participate in this kind of stuff are real crappy, both in terms of PR, and content. Also, most of them will be unrelated to your site's theme. So they won't bring you targeted traffic. It's easy to spot websites that participate in these kind of networks, since the links are usually footer/header links and there are other footprints. So of course search engines, especially Google, know about these link networks and frown upon them. Also, having your links in one specific location on your page such as footer doesn't look natural. Bottom line: If you need quality white hat link building, don't use those. Hope this helps, Warkot