I installed it last week and have had no problems. Seems to fix a lot of the little quirks on the iPAQ.***
I can't stress this enough - if you plan to install the upgrade, make sure you do a FULL backup of your device to your desktop PC before installing. Part of the installation process is to do a hard reset on your device (which wipes out every piece of data and all installed programs on your iPAQ). If you have done the backup, you just restore after upgrading the ROM.
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So far so good - I see no reason not to upgrade.
iPAUL