I'm using the HTC S620 since November 2006 and I'd say it's a brilliant piece of hardware (owned few Qtek PDA's and i-mate's SP3, SP3i Smartphones before).

On the software side there are critical misses, which call for a few must-have 3rd party software:

• Agenda One, as a more powerful PIM (Calendar and Tasks) incl. a PIM Search engine (will not search in files though)
• Gmail and Google Maps Java midlets (free)
• jMirc Java midlet for the IRC die-hards (free)
• Smartphone Find and Smartphone Notes - again, Smartphone Find will search in PIM (Contacts, Calendar, Tasks, Notes), SMS, Email and only i file names but not in file content
• Orneta Notepad Mobile, as text editor
• Pocket Controller-Professional (SP), for managing the Smartphone from your desktop PC, incl. file sync between PC and Smartphone (julie's wish, i guess).

I found two annoying slip-ups:

• Can't figure out yet how to silence the ring when receiving a call. The options given are to Accept or Dismiss the incoming call, no way to mute the ringer
• Cut/Copy/Paste feature for text fields. I found a piece of software called VitoCopyPaste.exe which can be launch at startup, it seems to do the job. Another option seems to be Orneta Scissors but i didnt test it yet.

Except for the ringer mute for incoming calls, it seems that there are some free and $$$ options for the software.