Where can we trial the various module before we buy

one of the most challenging problem i have with UNA is to get to know the platform better and test all those rich and paid module who micht be of interest.

Many module presentation pages are really truly lacking description and there is no where where we could demo them, thats a big downfall for this kind of business.

I do have a free version in testing on my own servers, but demos are neecssary, especially when time is not laways taken to communicate thouroughly about services/modules.