Mantissa / Nevow activity

Hi,

It is a bit difficult to assess how active these two projects are.

It seems they hold great promise, and present what one would expect to be a strong alternative to other Python frameworks.

However, I have to admit that the sparsity of activity seems a little unsettling to commit to using such a framework.

Are these frameworks seen as primarily experimental and will someday be the genesis of some Twisted Web Framework (i.e. in a couple of years).  

Or are these frameworks being used in commonly and extensively?

Thanks very much - hoping this comes across as pragmatic and not negative (the former is my intent).

--Ted