First the HD Radio feature. I'll be honest in that I've never spent any money on buying an HD Radio unit (why would I?) so the opportunity to compare it to satellite radio was irresistible.  Sure I've played with display/demo units, but that's hardly a good testing environment. The best environment is in your home with the volume cranked up.

Honestly (and I'm trying not to show any bias here) while the HD Radio stations that I could pick up sounded good, they didn't sound much better than regular FM. "CD-quality" is hardly a good description, and with the incredible quality of the speakers on this unit - trust me, you can tell the difference. But maybe I'll save my additional criticism of HD Radio for later, as this is just an initial impression of the Polk unit.

An option for the Polk Audio I-Sonic is the XM Mini-Tuner plus XM Antenna (sold separately). While this is an option, Polk has built-in XM into many of the unit functions, including the remote seen below.

The XM Mini-Tuner, which I've only seen with the Samsung Nexus previously, includes the Mini-Tuner cartridge as well as the dock and a separate XM antenna.

The Polk I-Sonic is more than just a radio. Much more. Just look at the back of the unit and you realize that video plays a key part in the overall experience.

Here's where the XM Mini-Tuner connects into the Polk I-Sonic:

The addition of the XM Mini-Tuner doesn't take up much room at all:
 

And with the push of a button you're surrounded with incredibly crisp XM channels.
 

A full review of the Polk Audio I-Sonic will be soon to come, but from the initial impressions this thing is a mind-blower. The speakers alone have an incredible range (goosebump factor of 10). I haven't yet touched the video capabilities, but it's audio capabilities alone will get an audiophile excited.

Pros:

• Incredible sound.
• Integrated everything.
• Easy XM installation/setup.

Cons:

• Price won't appeal to majority.
• HD Radio disappoints.
  
• Wish there was XMHD capabilties.