Voice quality
This is the selling point. HD voices are comfortable for full articles, people compare them favourably to Instapaper/Pocket system TTS and often to Readwise's listen mode. I've done whole New Yorker-length pieces on a walk without wanting to turn it off, which is rare for TTS.
Occasional weird stress on a word, and I've seen people mention little "period" glitches. Not a dealbreaker for me.


