Hi, I`m former customer of linksmanagement.com and i`d like to share my experience. They disclaimed to have huge inventory – which is true. All websites are great – this is not true! Do not be fooled by high PR of the website it could be spammed site. Always check website before you`ll buy it. Hard to understood that the juiciest links hidden under the “Advanced” filter. If you clever enough to play with DA, PA, niche – bingo! You`ll get great links. So it`s not for beginner, definitely.
I personally won't advise my clients to use any kind of link building programs. If you doing your content and on-page SEO correctly, you will get the ranking.