I got mine a few days ago too and agree with your comments. It is heavier than the paperbacks I usually read but lighter than most any hardback I've read. Don't worry it will get lighter as time goes by as your arm gets stronger from holding it
One thing that I found is that it was more comfortable for me to hold the DX upside down, then the next page button falls right under the top of my left thumb.
I've been using the TTS to read to me with headphones and it "turns" the page for me. Seems like I retain more by hearing and reading at the same time.