I’ve tested both overseas link sellers and
link building services in USA, and I’ll say this — you get what you pay for. Cheap gigs gave me links on spam blogs. The US-based agency wasn’t cheap, but they got industry-relevant placements and real blogger outreach.
Tip: Ask for sample links before signing anything. Quality links matter more than quantity, especially now. If they promise “100 links in a week,” run. Good SEO is slow, but it sticks.