But isn't there a penalty filing Form 4868 if you owe the taxes? If so, it flows down to state tax extensions.Based on recommendations here, I began using TurboTax about 5 years ago, when I could no longer afford to pay someone else to do it. I have always used the "Home and Business" version that I pick up at Costco in January at a discounted price, as my taxes are a bit tricky, being self-employed with a house, kids, and a wife with a W-30.
For the last 5 years, I have filed a Form 4868 extension, so that I have up until October 15th to send my taxes in. Since I am self-employed, I make the necessary quarterly payments and never owe money on April 15th. If I have overpaid, which is always the case, I just roll it over to the next year anyway, so I don't require a refund and therefore have no rush to get my taxes in.
I found that when I do my taxes in August or September, upon first boot, TurboTax installs all the necessary updates and bug fixes. By this time, it seems pretty bug-free after all the earlier-in-the-year user complaints have been addressed. Since all these bugs get worked out before I start, I haven't had any problems with TurboTax.
If you need a refund earlier in the year or potentially need to make a payment, my method won't work for you, but it's been pretty solid for me. Each year, I also make notes and take screen shots so that the following year is easier and faster to complete.