I was hoping to like this but the pricing is a total deal-breaker for me.
Personally, AWS' and Google's pay-as-you-go plan win every time regardless of the "better" and "cheaper" claims IMO. You must introduce pay-as-you-go plans if you really want some good traction. I really like the Entrepreneur voice (the professor sounds like Jordan Peterson)
On more thing, I think in the comparison you have sampled the AWS non-neural voice while using the price of neural voice for the price comparison - this does not sound like a fair comparison to me (but please correct me if I'm wrong and I'll edit my comment).