Uneven user interface - sometimes its pop up windows, sometimes its advance buttons on bottom of screens, which are often too long and require a good deal of panning downwards. Unpleasant error checking -- sometimes leaves you back in the program requiring manual return to correct stage in program. Help screens aren't particularly helpful.
I've used this tax software for several years and have been very happy with it. Our taxes are pretty straightforward and not terribly complex, so it's pretty easy, and H&R Block makes it even easier. I like the fact that I have audit protection, and a quick check of my return for errors, before I e-file. The free e-file is great. Also find that it will use last year's tax return to retrieve that info needed on this year's return. Very convenient and reliable.