Indiamart marketplace is indeed a way ahead compare to any other business or trade sites.
I myself, have been using this site for the past 4 years now for my purchase requirements and I am more or less satisfied with the services.
I made several contacts with various suppliers on this website. One of those started his relation with this company with just a homepage but as soon as he started receiving the business inquiries, he upgraded to a larger package. Though it costed very high to him initially, but he says that international business settled all the grudges. As he received atleast 3 bulk orders from me only.
I shall recommend to use one of its service to everyone which is in fact absolutely free. I am talking about its trade leads section, where you may not only post your buying or selling requirements but also participate in others buy or sell requirements from international companies without any charges. We must take advantage of this free feature before it becomes paid like other web portals.
Cheers.