I picked up the Slingbox HD yesterday, was on sale for $299 at FS... The PQ on the LAN is a big improvement over the PQ from my PRO and Classic. I have had no problems streaming HD quality video from it to my desktop and 2 laptops. Despite the Slingbox HD being tethered to a wireless G router running in client-bridge mode, I was still getting stream rates of around 8000 Kbps on the desktop (wired to the gateway router) and up to around 4-6000 Kbps on the laptops.
The only problem was when I played the HD stream on an MSI Wind netbook. The Atom CPU is not powerful enough to enable smooth video and audio HD quality streaming. I had to "downgrade" the stream to "VGA" or SD quality (640x480) for the video and audio stream to play smoothly. Despite this downgrade however, the video still look good... still much better than the PQ I got streaming from a Slingbox PRO to the netbook.
I thought the SlingPlayer 2.0 software was better than version 1.5. I only had to set-up my Slingbox HD, PRO, and Classic once (from my desktop) and SlingPlayer 2.0 then uploaded these config settings to my SlingBox online account. I was then able to run SlingPlayer 2.0 from 2 laptops and the netbook without the need to reconfigure my slingboxes and my favorites... neat.