Summary: I purchased one of these a few weeks ago, and it didn't work. I was on the phone with TiVo and they confirmed it was the My DVR Expander. I decided to give this product one more shot, so I exchanged the first one, and it installed perfectly the first attempt. It's only been running for a few days now, but so far so good. Very easy to setup for TiVo. If the first one would've worked, I'd have given it 5 stars.
Pros: Attractive Design, Easy To Setup, Easy to use, High Capacity
Summary: Installation was unsuccessful with my Series 3 HD TiVo. The setup should've been very straight forward, but in the end the installation never took, and it caused the TiVo to reset itself repeatedly. I spent over an hour on the phone with TiVo, and they confirmed it was the My DVR Expander. I'm returning his one and buying another with the hopes that I was just unlucky in getting a rare lemon. However I have to give this item a 1 star based on this first experience.
Summary: Right out of the box this external hard drive was connected with my TiVo HD in less than 10 minutes. The TiVo detects the new drive and prompts you to install using the familiar TiVo menu system. It worked so well and seamlessly that I wasn't sure it was really working until I verified the extra storage capacity. Now I have plenty of room to store additional movies and TV programs I want to save.
Summary: Best price found on J&R Electronics - free shipping, too! Very fast delivery. Setup took only a few minutes, just plug it in and turn it on, then power up your TiVo. That's IT. Now I have massive storage and don't have to worry about losing stuff within days. I can also record more stuff in HD. Highly recommend this, esp now that it comes in a big 1TB model, and the price has dropped.