Well, $54K AGI limit is one thing.
I'm pretty sure they're not the only ones to offer free filing for those under that limit (it might be a Federal requirement to offer free filings for lower-income individuals - I know I've seen this "free" offer elsewhere, not at HRB).
Still gotta pay $30 for state filings.
I've been using CompleteTax for four or five years, I've been happy with it. As a returning user, I think it cost me $25 for the Federal filing and $10 for the state. Very user-friendly interface.