I'm pretty wary of this DAB stuff - I listen to a fair bit of radio (From radios 1 2 and 4 / classic FM / jazz FM ) on a variety of kit - A quad 33/303/FM3, a couple of Roberts portables and my car radio. I bought a "Pure" portable at £99 to investigate DAB and also listen via my "freeview" box.
Sadly my experiences of DAB/ FM show FM wins hands down ( imo ) - a £40 2nd hand roberts radio sounds much better than the Pure portable. I've tried the output from my freeview box to amp and the sound was good - hiss free and clear, but compressed. The FM3 is better by far.
This is perhaps the view of a "traditional" radio listener - but of someone who cares about sound. I wory about digital broadcasting in general, even prefering the picture on my analogue TV (decent arial/ Sony TV) to that which I get for terestrial stations on digital.