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Swisscom Mobile provided me with their "Mobile Unlimited" system for testing for a month. I installed the PCCard today and had a very good experience out of the box.

The drivers are rather hefty, but they have to add a layer on top of Windows' networking stack that provides for the "seamless connection switching" which isn't supported natively by Windows and which works exceptionally well. So no matter how you are connected to the net, Swisscom Public WLAN (2mbit/sec), UMTS (384kbit/sec) or GPRS (56kbit/sec), the card always chooses the fastest available connection without disrupting the network connection. The other nice thing is that I have now tested the thing in quite a few spots and never had it fall back from UMTS to GPRS (except once in an elevator).

I highly recommend using the newest drivers / management software as their virtual network drivers only bind to adapters that need it (not to all adapters like the previous version used to do).

I also heard that the software has problems running on Windows XP Tablet PC edition, but I have not tested this myself.

The only thing that keeps me from buying this for myself after my test ends is the still expensive price plan with CHF 1.- to CHF 2.50 per megabyte of data transferred. (Testing on day one alone generated 60MB of traffic which would sum up to CHF 134.-

Ouch.