Yep, just signed up. For those paying $35/month, have you thought about splitting it w/another couple? We share the subscription with another couple and split the cost, so pay $17.50/month. You can technically have up to 6 google accounts on your YouTubeTV account, but you're limited to three streams at any one time. So we figured we'd stick w/the two couples.
As for the Sling comparison, I had sling before. A couple of issues. One, DVR on sling is an extra $5 (free w/YouTubeTV). Two, if you're getting Sling to watch, say, college football, or the MLB playoffs (why I originally got Sling), you end up having to get the "Orange" and the "Blue" subscription so that you can get ESPN and FS1. Third, and most importantly in my book, I found the quality of Sling to be subpar. Multiple instances where Sling went down (and it wasn't me...I checked their twitter), sometimes for extended periods. Poor customer service/no response when I emailed/tweeted at them.
OH, one more thing about Sling. I use a Chromebook as my main computer. Can't stream Sling on a chromebook, at least not currently. Another strike against it.
