sharing some info..
Got the 6131 yesterday, It is very compact, in comparison to the 6100 it is replacing. I got the unit mainly for the PVR capabilities and the add on feature of the EXT HD. As I had a 500gig sata Seagate barracuda 7200 not been used I went out an bought a Taotec ultimate 3500 case, $20.00 at pccyber.com.The case is all black aluminum with black plastic stand to hold the enclosure upright on its side. Standing next to the 6131 it looks good. Has a green led to show it is on, and flashing blue led when writing to the drive.
Connecting the HD to the 6131 was just a matter of plugging in the power adapter and the USB. The 6131 saw the HD and request to format. Took 4-5 minutes with the 6131 going to a blank screen, reboot, and download guide at the end. I wasn't expecting this and at first I taught the 6131 had died.
According to the menu 'my recordings', I will get 66Hours of HD and 495Hours of SD. By the way there is no info in the manual on how to do recordings, you learn on the fly trying and reading the on screen help. I was very impressed with the quality of the HD recording, is was identical to the HD feed.
My only disappointment is the 6131 does not have UHF remote capabilities, something the 6100 has. I would like to hear how I might be able to add on this feature if possible.