It's a quite good tool. It allows to listen article or web. Is is especially good when walking or have something other to do (like dish, laundry...). The voice synthesis is sometimes weird which is rather an issue of selected TTS engine than extension itself.
The most annoying flaw is loosing position in a long text when paused or internet signal lost. This mean manually locate part of text where to continue. Any search function or automatic bookmark insertion would be very useful.