I know that project rather well, I'm subscribed to their mailing list
and participated quickly to it before starting "parlement".
My troubles with it:
- voting method is "Condorcet", which is often considered slightly too
complex for most people
- special powers to some administrators whose role is to organise polls
- technology is a very good one, but sadly it is not used much in the
world and will have troubles finding programmers
- no possibility to use the whole system as a forum where every
question/answer is just one more post
- few considerations for security
But, they have a group of intelligent people involved in a cool social
idea/ideal.