I wanted to try out this service for months and months, and never got round to it.
I've tried a few SEO services from BHW, all of which came with a lot of hype in the sales thread. I got OK results but seriously, for the price I was paying (e.g. $600/month), I expected more.
I started with Linkpushing exactly a month ago for one site, and pushed 12 LPs. Traffic and rankings have been steadily increasing. ROI is awesome since it only cost around $10 per linkpush (madness!). Today traffic peaked and it's more than double what it was 3 Sundays ago. Granted the previous services I used must have had a part to play but LinkPushing was the final wind that gave me the most noticeable results. I will still use other services on that site to vary the backlink profile, but LPs are good "bread & butter" links to have.
I don't personally think of this as an SEO "service" as such, it's more of an SEO "tool" with a web interface. You log in, create a new LP, specify which URL(s), keywords to use. You choose a relative article from their repository or you can add your own, and you submit. Over the next 3 or so weeks, it then starts to build your links for you. Moreso, the linking is done in a way to minimise footprints, and I know the guys are on top of keeping up to date with their methodologies to keep everything looking as natural as possible.
Be warned though, you have to have some understanding of SEO. Your onsite SEO has to be spot on. You have to add your own LSI keywords etc. As an extreme example, you can easily mess up your site if you deploy 25 LPs with one keyword all to the same URL of a new site. It can be used well or it can be used badly. What it does is automate the manual building of links within relevant articles, which you have a degree of control over. As I said, it's a tool, and a great one at that if you use it properly. I know little SEO, but a read of this forum, LinkPushing's blog, and the application of common sense seems to be sufficient to use this effectively.
Thumbs up from me.