I have only a limited experience with them in the personal tax prep context and I wouldn't recommend them. Basically for what they offer you'd be better off doing it on Turbo Tax. The guy doesn't ask you questions, doesn't try to coax out of you possible deductions or savings. You don't get the sense he's well versed in the nooks and crannies of the tax code and that he can save you money. In fact, you don't feel like he's at all concerned about trying to maximize your return. Which, if I'm paying someone money to do my taxes, I want more knowledge (and certainly not LESS) than what's offered on TurboTax.
Pros: Nice Receptionist
Cons: unknowledgeable, unenthusiastic
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