There not bad. They're a little more monotone, that is, they're not
robotic but I don't think they do as many tone changes for punctuation,
they do tone changes mostly at the ends of sentences, rather than in the
middle. I don't think they can do pitch changes for capitalization. The
rate can only go so high, probably comparable to the fastest default
one-core rate that you can get from NVDA if you haven't changed the
one-core voice speed to make it go faster. I don't know that I'd use it
as my primary synthesizer, but that having been said, they're pretty
usable. If the addons could be updated they'd make a pretty good
portable voice for older systems I think. They're worth trying anyway,
you can always uninstall it if you don't like it.