I would echo those comments too.
We've used Frog for the last 1 year and the biggest plus is the ease at which non-techy people can add content/ actually use the vle. there are obviously downsides to the product but the fact that basically everyone can use and develop it is a big plus thus empowering the staff and their own subject areas.
the other downside is the cost... but then it's a bit like some of the other software/ hardware products out there on the market at the moment.