I wouldn't have left ATX except for ongoing problems with my state Business Entity Returns.
I find Drake more reliable, with much better support. There is definitely is a learning curve because Drake is not Form based.
Drake's efiling process is much quicker and more reliable. Drake does small frequent program updates which only take 1 or 2 minutes.
Drake definitely releases forms and state returns much sooner than ATX.
The hardest thing for me to get used to was Drake has very busy input sheets, which can result in overlooking a check box etc.
Even now after 3 years, it takes me a bit longer to do a return in Drake. However that's offset by fewer problems and better support.