I am about to be 50 and have used more Windows handheld devices than I can count. I started with a Casio Cassiopeia A20 in 1998 and have owned SEVERAL HP iPAQs (both PDAs and Windows Phones) as well as many HTC and a couple of Samsung PDA Phones. I have to agree with the concensus here - this is the best PDA phone I have ever owned. I have used Palms, Androids and iPhones and none can compare with this device. It is not perfect, but comes closer to that standard than any other.
Now . . . when we can load our own ROMS we will show everybody how a PDA phone is SUPPOSED to work!