I used this not long after it first came out, but cancelled within the trial period with the idea that I may go back in the future once some of the blogs had aged and built up some strength and if they add several more platforms. The administration was good, and professionally run.
I didn't see much of a benefit within the month which is to be expected, but I suspect that if I had continued it longer term, I may have saw some benefit for my extremely low competition projects. It was a long time ago now, and the system may have changed, but the inherent flaw within it is that a lot of these blogs are new, and have numerous outgoing links, with very little incoming linkage and eventually your link gets buried on an already weak blog ? they need to strengthen up the individual blogs for it to be effective. Add to that the lack of IP diversity, and you end up with what is essentially a shallow pool of weak reciprocal links. They really need to be adding platforms by the hundreds, not 10's, for it to have a significant effect imo.
Another thing I wasn't to keen on was the quality of what some other people were outputting, and there isn't anything that can be done about that. It also is to be expected that not all your links are going to show up, this isn't a Link Juicer issue per se, it's the nature of the search engines. But it did raise some red flags when only one link showed a couple of months after I cancelled, only to drop away a few weeks later; last time I checked, it hadn't come back. To me, this pretty much confirms my thoughts on the strength of these links.
I feel these type of links can be useful and do have their place, but for the amount of time it takes to set up each individual campaign in the beginning, it just wasn't worth it for me. It may be worth it for other people.