I've actually thought the same thing. The GV app works fine for me. I only text through GV.I tried Handcent briefly, but I'm using Google Voice for SMS so I never spent much time with it. I've looked at the screenshots, and I just don't get it. What does everyone like so much about Handcent SMS?
the quick reply thing is the best part if you are working it just pops up you answer and its gone and you are still doing what you were doing