Am I trusting my tax data to online services? Fat chance. Too many people have my data already.
More precisely, my wife runs TurboTax, I run errands and fetch papers and caffeine.
Back in the 80s, we went to H&R Block because of the complexity of moving expenses from my first post-college job, and my wife said "that looks easy", took the H&R Block tax prep course and did a year of working there, then a couple years at another tax/accounting company, then started her own tax business, using TurboTax and a laptop. It was a bit difficult to keep everything working, because TurboTax assumed you had a desktop PC with a real disk drive instead of floppies, but after a couple years of using RAMdoubler and disk compression, she was able to upgrade to a laptop that resembled what TurboTax needed. Eventually she went back to doing computer businesses and was able to get rid of most of her tax clients (and eventually all of them), but she's been doing the taxes in the years since then.
I think we're finally using the personal version of TurboTax by now; we used the tax-preparer version for many years because there were things the personal one just couldn't do or didn't do well (including importing previous years' data from the tax-preparer version, which kept us on that for a couple years after we would have switched.)