I took the plunge and upgraded my old original spec h3630 to PPC2002 and am well impressed. Look and feel are the same as WM2003 (nonSE) so that makes for a common functional paradigm, which is of great benefit even to a techie like myself.
I cant say that USB support is any faster or better - just feels the same to me. But thats no bad thing, it could have been worse!
Compatibility with my existing apps on the h3630 has persisted. I am able to run the Navman GPS software and the D-Link WiFi card drivers work also. Full functionality to the previous set-up has been maintained.
The whole exercise to backup the original OS, install the PPC2002 and restore my apps and data took around 2-1/2 hours. I did other "stuff" while I was waiting for the lengthy parts of the procedure to complete.
So, all in all, not a bad few hours work. Now to back the whole thing up!