I received L254 last night on my 522. I did notice one odd behavior, but I haven't tried this in a while, so it may be nothing new. I figured since the portable dish units are due out soon, they would have to turn the usb on at some point. I tried plugging in a USB flash drive and an external USB HD. The flash drive caused the 522 to reboot almost immediately, while the HD took almost a full minute before a reboot. It seems like they may have enabled the USB functionality and the 522 is looking for something very specific on my USB devices which obviously wasn't there. I'm basing the difference in reboot time on the fact that my flash drive is 128mb and the HD is 40GB.