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The 4150 has Bluetooth and WIFI built in the 2210 only has Bluetooth.
1GB SD cards are already available and are far more battery efficient than micro drives.
The only reason to have the 2210 is if you have CF cards. I already had a 256MB and WIFI card from my 3850 and CF plus pack.
BTW The new grips probably won't last long, I had to replace mine after a few months with ones from PPC Techs that screw on, although they are much better than the orginal ones.
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