Imported -3000 for last years AGI which I didn't catch before filing. 1040 was rejected and I had a devil of a time correcting the AGI to what it should be.
I have been using H&R Block software for years without a problem. This year's version (2017) has had transfer errors from my 2016 return. It transferred the wrong State refund and transferred the wrong AIG from my 2016 return (which is on my computer).
Pros: Easy to install, Easy to fix issues, Easy to prepare