This may be old news but -
I took advantage of the H&R Block 10% bonus offer.
The offer is 5% if using Free or Basic, 10% if using the more expensive products. I had investments, etc so had to use one of the more expensive packages.
I have the deductions maxed out, but still have too much withholding. My return was significant, $2500 of which I took in Amazon credit. The fee H&R price was $50, so net, I got paid $200 to do my taxes :)
Looking at it as an investment, not too many investments offer a guaranteed 10% return! It always bothers me Uncle Sam was sitting on my money instead of me... now I'm getting a nice rate of return on it.
good luck!