According to the results of last month's poll about Dell Streak phone use here at Streak Smart, a whopping 95% of voters are using their devices as phones and not WiFi-only tablets/MIDs.
I keep flip-flopping between the two uses; I'm back at WiFi-only at the moment. I actually never planned to use the Streak as a phone in the first place due to its size, so I kind of expected to see the results split more evenly. I knew that most people would have replaced their previous cell phones with the Streak, but I thought a good chunk of users would be carrying it around as a secondary device too. I can certainly see the "total convergence" appeal of the Streak, but there are times when it's just a little too big for what I need. In those cases, I leave it at home in favor of my HTC EVO or iPhone 4.