I disagree. G has made it very clear they are not okay with these types of networks. Isn't it strange BMR closes registration right after the recent network crack down? Its very clear that G is targeting these networks and punishing those who use them. I have a site that was penalized in which I used a variety of these types of services. I lost 70% of traffic overnight.
My site didn't drop -100 that a lot of other people are reporting so I figure I will continue link building. 30 days later I am still stagnant and haven't moved up for any keywords. I pushed a pretty insane amount of high quality backlinks in hopes to get back to #1 for my KWs, hasn't happened.
I have also heard others report the same thing, that are unable to move after getting a portion of their link profile is deindexed. Im not saying I know for certain there is a penalty related to using these networks, but it certainly appears that way.