Yes, their quality is great but the cost is astronomical — I pay about $8 in Azure TTS bills alone for TTS-ing a 500-page book (what you can scan per month with a $10 subscription), whereas Eleven Labs would be about $100 for the same length. I found Azure to be the best bang-for-the-buck, although I'm on the lookout for more affordable high-quality TTS, which would also let me drop the price point of the app.