fedidaido said:
I was wondering if linkcolider service will effect our site rankings? Anyone tried their service before?
Firstly you have to consider if the system is Penguin and Panda friendly, if it is not Google will smell a rat and penalise you for it.
You also have to consider if the links are being built naturally, if they are not then Google will again smell rat.
You also have to consider the genre of sites you are getting links from, since Panda and Penguin it's not just the number of backlinks you have, it's their relevance to your niche that is important.
e.g if you have a site about insects then links from other say PR2 sites about insects will do you more favours than links from sites about cowboys which is PR9.
As for the quality of LinkCollider I would take a long hard look at the site itself, in two of the pages available to guests I spotted two grammar errors, that rings alarm bells for me, if they take that much care promoting themselves, just how good are they.
First impressions is that is a link wheel site where you will spend time writing articles on other sites, to get tokens, which then enable others to "spend" on writing articles on your site, basically it's a form of post exchange.
Personally I think you would be better off, writing or posting articles on your site, and leaving links on in niche sites. I would rather spend time trying to drive traffic to my site, than working to get traffic to other sites.