The Cnet testers said the sound quality is good, not great. Garbage in garbage out, if the station signal is overly compressed it will sound no better than a poor internet stream at 28k
The authors pointed out, if you aren't happy with radio as is, then having additional HD2/HD3 won't make you happy.
They gave great praises to WBGO's classic jazz, it sounded rich and full.
To recap, if the station cares a hoot about sound quality and their engineers knows what they're doing HD can sound good. If you stand still, with your arms stretch-out, like a bird in flight, the HD signal will lock on. If you don't like radio with it's endless streams of commercials and promos you won't be happy either way..
Though the price point is nice at $50.00 and it's a nice way to experiment with HD without losing your shirt..
If reminds me of the old FM converters.. with an ipod plugin you've got an HD capable car radio..