Models that pass key safety requirements have no serious issues. Ones that score around 60-65% for performance may have minor hazards such as a door that doesn't self-close or edges/projections that could injure if a child runs into them. Serious failures include detachable small parts, snagging/strangulation hazards, clmbing footholds or failure of the limb or head entrapment requirements of both Australian cot and European playpen standards.
Products we've recommended have passed all our safety and durability tests. We sometimes find that no products pass all our safety tests, so that we can't recommend any, but usually find some models with only minor failures that are still worth considering.