Installed and registered easily and fine.
Did a small test myself, using the different speakers and speeds. All worked. The voices are ok, robotic sounding, not natural, but that is to be expected.
I compared it to ReadPlease Free, and it is similar. However, I must say the voice reading the text sounded much better (a bit less robotic) in Apex Text to speech, and saving it as a .wav file is a plus.
Options to save in other audio file formats would be great, and, as the others have said, reading other file formats (word, pdf, .doc….) would be even better.
Thank you Apex and SOS!