Cognism is the highest-rated data provider on G2 at 4.6/5 from 1,200+ reviews, and for a specific use case, it's genuinely the best product available: phone-heavy outbound in EU/UK markets with full GDPR compliance. Diamond Data, their human-verified mobile service, delivers ~98% phone accuracy, and users consistently report 2–3x higher connect rates compared to unverified mobile data.
The friction points are practical. There's no free trial, you must go through a full enterprise discovery and negotiation process before testing data quality for your specific market. Annual contracts are mandatory. Estimated pricing runs $15,000–$25,000+/yr. And Cognism's North American coverage, while not absent, is noticeably weaker than its European depth. For US-focused teams or those without the budget for an enterprise annual contract, Cognism creates barriers that are hard to justify.