SEO is a hit and miss kind of game (I guess). I have not had good results with SEOshark, actually been dropping in SERP's. My first order was in November, second order was in January, so all up about 3months of link building.
First order was OK, got some good movement, second order had the opposite effect.
I was targeting 18 kw's (Tiger shark)
SERPS:
12 Kws nothing at all, not even a blip on the radar.
From the 6Kws that had movement:
One had positive movement, by a whopping 1 spot, the rest all negative, one KW fell 210 spots (way down)
I say SEO is a hit miss, because you can read in the responses on the thread that some people actually got great results, which is awesome. It just did not work for my site.
I am not here to rag on SEOsharks BST, I am just letting everyone know how my site has been impacted.
I wish the SEOshark team all the best and hope they can continue to help people with their sites!