I have bought 5 batches of PBNS (50 total links) from BlackBDO and have seen amazing SERP improvements.
The PBNs are of the highest quality I have ever seen. The cost per post is very high but worth it. The sites have very high metrics, but most importantly look like genuine sites - not just a site with a random wordpress blog. I am from the UK and have read through a few of the posts, they are native English and not spammy at all, but in fact, genuine handwritten unique articles. All PBN links are still active on the homepage giving our money site huge amounts of juice. Organic traffic has increased 10-fold.
We are targeting Medium and High traffic keywords (very hard to rank for!) But most keywords are now page 1. The majority of these results are from only 20 of the links, as 30 of the links have not been live for long. The anchor links are mostly exact match + a random but relative word, for example, Buy X, Best X UK, Cheap X. Other SEO has been done (outside of the service), including press releases and the website has also been featured on a DA 90+ site, therefore the results are not 100% due to these PBNS. I would say 75-80%.
The results are based upon google.co.uk search engine. The money site is only targeting the UK market.
Some examples of results:
KW 1: 110,000 Monthly Search, Position 26 -> 5
KW 2: 74,000 Monthly Search, Position 78 -> 3
The image below is from SerpLab. Although it states a lot of the keywords where N/A at first, this was way before I began to work with BlackBDO. Keywords were all between position 10-100 when the PBN links started to be added.
I have found the communication with BlackBDO very good and he is not just looking to make money like the majority of users on this site, he is has offered genuine advice and help in regards to SEO. I will continue to work with BlackBDO and would not take a look at another PBN service!