Yes, it is true that there are some fake sites out there, which sell junk information.
I personally don't know about Lordsen. However I know about another site which is pure rubbish
www.ePlanetLabs.com I bought something from ePlanetLabs for SCMAD and it is horrible. And unfortunately it is one of the links thats comes up on top in the sponsored links of google.
Infact once you buy something, they will send you an email saying
'you bought this product at your own risk' and please don't contact us about the quality of the product.
Just watch out what you guys buy :-)