Help! Need a Property Tax Reassessment Attorney in Texas

[Warren Z.]

I recently had my Texas rental property taxes reassessed to a higher basis and am looking to appeal the assessor's decision. I remember seeing a bunch of mailers from attorneys specializing in tax reassessment for no fee (they get paid a percentage off the savings they are able to get). 

Has anyone worked with a reputable no fee firm? I Yelped a couple firms online and was horrified to see all of negative reviews on them.