I'm on TW in Southern California, Eagle Rock to be specific.
After filling out the web form, a couple of Motorola units arrived a month later with no email or notice.
Hooked them up, one had a dead power supply which I replaced from my shop, steady flashing yellow light on both.
Checked firmware version, it was 1.27. I had read here (or somewhere?) that 1.35 was required to have them work.
Called TW. They tried hitting them a couple of times, no joy, the CSR kept saying I had to reboot the TiVo. I said that was like computer tech support insisting I reinstall Windows, and I wouldn't reboot the TiVo until I had a solid yellow light.
Finally, he said they would roll a truck. Despite my asking the tech have two TA's with him, he shows up with one, says the guy at the factory would not give him two. Also admits he knows NOTHING about TA's, they're not due for training until the following week although TW's been shipping them for a month in this area. So I ask him if he's interested, and when he says yes, take about 10 minutes and school him. He pays attention, makes some notes, gets the concept.
We hook up the one he's brought with him, it's at firmware 1.35, he calls in, they hit it from Mom, and the TiVo spontaneously reboots. While it's rebooting, the yellow light turns solid. When it's done rebooting, it's all working. He's remarkably impressed that I knew which firmware version was required, knew where to look on the diagnostics screen, and that the damn thing actually works now.
He calls back in and insists another tech be sent to his next call because he's not done, drives all the way back to the factory to get me another TA. Shows up about 45 minutes later, we install the second one, it's also at 1.35, he calls in, they hit it, it begins working immediately. The second S3 did not reboot.
No problems so far, it's been about a week.