Been only using this service and have lost big time on ranking today . Mostly sites lost big time on serps
I must admin that those dances got me worried when I started using Linkpushing, even when ranks got back I was still not sure if i was gonna gain anything. But Linkpushing, although it takes some time to stabilize in ranks, always delivered the promised ranks for me.
When you think about it, that kind of a structure, link diversity in type, age, PR, structure variations is the key to success in this business. As BTB pointed out, diversifying with a few other link building methods is a sure winner, but even without those Linkpushing gets the job done quickly and effectively. It's one of the services on BHW that has prevailed through all of the algo changes so far, and you can't say that for many services.
I've been where you are, but I would suggest you give it a week or so more until you can mark your serp ranks as locked. I am only writing this because I've been there where you are, and I am glad I didn't give up on this service.
Granted, not all cases are the same in SEO, but I just wanted to tell you my experience in case you are interested in how it worked out for some other member.