Class 4 shingles are tested by dropping steel balls on them; they must survive without cracking. In hail country like DFW, that matters.
They usually cost somewhat more than standard shingles. When your roof is replaced through an insurance claim, ask about upgrading.
"Impact-resistant" does not mean hail-proof. Very large hail can still damage any roof.
Related: Impact-resistant shingles · Roof cost estimator · all guides
Written by Mike Davis, owner of RezComm Professional Services.
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For many homeowners, yes — better hail resistance and a possible insurance discount.
Send your insurer the shingle certificate after installation.