I recently picked up a Cingular 8125 as a single unit replacement for my Nokia 6630 and HP iPAQ hx4700 for work.  I am having a small issue with getting my phone number re-estabilished correctly but that is probably just an administrative problem.

So far I haven’t had too many technical issues, but I am learning a lot. One major thing I learned came from: HTC Wizards:

The HTC Wizard is a Pocket PC Phone built by High Tech Computer Corporation from Taiwan, and  it is sold as the
Qtek 9100, I-mate K-JAM, MDA Vario, Orange SPV M3000, O2 XDA Mini S,
Dopod 838 and Cingular 8125. [And probably soon others.]

So check out the forums at HTC Wizards for more details.  It seems like the place to learn more about this unit in the quickest way.

UPDATE (5/16/06): Newsfactor has a review of the Cingular 8125.  It gets a 4.5 out of 5 score.  I have to agree with pretty much everything written in the article.