I have used for one project and happy with the results overall. I personally find the voices quite realistic (saves me paying for ElevenLabs).

It doesn't seem to work well on words with apostrophise (eg. I'm, can't - "William Australian English" was one voice example if I remember correctly). Used its phonetic pronunciation feature to correct these (and a minor few other words such as "productivity") which I found did a good job (used an online search to get the IPA).

Like another reviewer, I was surprised how quickly the letters counter increased, extensively. However, as the founder mentioned on that other review - 200,000 characters per month will likely suffice (for me at at least, at this stage - time will tell).

Wish list:
1. Chapters within Projects - With ability to minimise / expand so I can quickly see the "chapter" I am working on, and the ability to export single chapter, all chapters with auto filenames, or entire project.
2. Select Voice View - Current options are "All" and "Recent". I would like to see another option called "Current Project" that only shows the voices used within the current project. It will grow or shrink, purely showing the voices in the current project (I used 3 voices in my first project).
3. Drag and drop blocks to rearrange (Move Up / Down is tedious when you have a lot of blocks) .
4. Ability to add blocks between blocks (per 3 above, a pain when one has a lot of blocks). Duplicate is an option for this, but the counter is increased based on the number of letters in the copied block, letters that will just be replaced. It would be friendlier to have another two options in the menu (Add Block Below and Add Block Above) or a " --- + --- " symbol on hover between blocks (graphically nicer and user friendly).
5. A default pause length between all blocks per project, potentially overridable per block. For example, I would like at least a 1 or 2 second pause between each block (otherwise I'd put the sentence within the same block). Manually adding a Pause at the end of every block was tedious.

Great work in progress, hope it does continue to expand and improve.