AFAIK Links4trade doesnt work the way some people think of, When a person registers for their services they are assigned a sub domain type of site for their links page, These links pages dont get benefit nor give benefit to links4trade.com Only the bottom link on the links page is a benefit for links4trade, other than that all link popularity transfer and Pagerank transfer happens from the client domain, Though they are hosted in a different server it just acts like a links page hosted on an other site,
This search explains that,
http://www.google.co...ade&btnG=Search This is the same way linksmanager works, Even they do all reciprocal link verification, registration and all other stuff on their own server, Only the links are hosted in client's site, But for links4trade.com links are hosted on sub domains( completely different sites according to search engines),
I am not giving a review for linksmanager and links4trade

, Just thought ill clear some doubt in people's mind,
Personally i love manual link exchange for all our clients, Manual link exchange do wonders finding relevant site, Checking whether they offer link exchange and sending link exchange request, Response rate is very high when we have a quality site for link building,