I'm on my second streak, the first was stolen recently. I bought the original about a year ago, and it's great. I did ponder alternative phones when I was getting the replacement, but the extra large screen won the day (again).
It's foolish to call it a tablet, or market it as one, since in reality it is a smartphone with a large screen. The extra screensize makes it much more comfortable to browse & play games than on the typical 4" smartphone.
My 'perfect' phone would have the same 5" screen as the Streak, but with a smaller bezel (it wastes at least an inch), dual core, higher resolution, and a camera with optical zoom. However, no such thing exists - the Streak is the nearest I can get.