Well, personally, I'd had hundreds of sites entered into it and the read tracking was much better than Reddit. On Reddit I have to vote on anything I want to disappear, Google Reader did it auto. Not that I would switch off anything I have entered that much data and state into anyway. It would have taken over a week to catch up on read status on all sites and switch over properly with no read queue on any of them.

Users putting data in is the best way to get them to stick around. It's also terrible for your rep when you kill the product like this.