The Nino has been a very good machine for me. Very reliable and easy to use. The only glitch has been with the Hyperlinked Active Desktop in the MS PowerToys. Compared to the Casio, it is more reliable. None of the disappearing memory card problems that I had with the Casio.
Sound quality is much better via the front mounted speaker.
Rechargable battery never runs dry. Menus and software open noticably faster. Click-on modem feels more secure. To big, about the size of the newer color PPC coming out, but the casio was tiny compared to the Nino. Still fits in a shirt pocket, but more awkward.