I have the X3i (the one with integrated WiFi). It is an excellent little unit, and very light/compact compared to the X5.
I tested the IR as far as I could back up in my apartment (about 20 feet), and it worked great with PDAwin. Much better than the X5's measly 3-5 feet with stock IR port.
However, I'm still planning to keep my X5 with PDA-ir for remote purposes. And use the X3i as my daily PDA.
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Jordan M. Wigley
Aximsite.com
jordan@aximsite.com