I like that you can create multiple demos in one project, which is great for keeping track of what's been created so far! Also it makes creating different variations very easy to do as well - no need to duplicate content over again just because we want to change something slightly.
The interface could be more intuitive (easier navigation between pages/sections), but this isn't really an issue once you've got used to using it anyway. We're looking into how good represe would fit within our existing workflow when designing new website features or redesigns etc., however currently there are other products out there that provide similar functionality too.