You can find reviews of legal LSA providers on platforms such as Google, Clutch, G2, and specialized legal marketing directories. I’d look specifically for reviews from law firms that mention Local Services Ads rather than relying only on general PPC or SEO reviews.
When comparing providers, pay attention to comments about lead quality, cost per qualified lead, Google verification, lead disputes, communication, and whether the agency can connect LSA leads to actual consultations and signed cases. A provider with many reviews is not necessarily better if those reviews are from unrelated industries.
Also ask the agency for relevant case studies or references from law firms in your practice area and market. That gives you a better idea of whether their LSA experience matches what you actually need.