I just purchased the Cingular 8125.

As I mentioned before, when using the Cingular and/or ATTw cell services, I recommend a phone supporting both the 850/900 bands for the best spectrum of coverage.

I was concerned that moving from my I-Mate 400mhz processor and larger screen to the new 8125 would be a let down. 

I do miss the larger screen but I like the better quality keyboard.

As far as the performance is concerned, my experience has been acceptable as long as I don't keep a large number of app's running.

I experienced two issues with the device. 

The first was a degradation of performance over a period of days.  Even after soft resetting, the performance was still much worse than in the beginning.  A hard reset resolved the performance problem for about a day.

I also had a horrible problem with my Alarm on the device. I use my phone as an alarm clock. Previously set alarms would still go off!  I took the phone back and I still had the same problem on the new phone

It was at this point that I suspected a software problem.

I upgraded the ROM. 

btw, this requires a hard reset which means you lose all installed programs and data that is not

on your mini-SD. 

Since I sync with my desktop, recovering my important data is not an issue.

I found that my ROM version (select - Start, settings, system, Device information) on the device from the OEM was something like 1.8x. 

I upgraded the ROM to version 2.25.11.1 WWE, by connecting to the USB through activesync and selecting download from this HTC link.

It has been over a week now and the performance of the device has been great and the Alarm problem has been resolved.  

 

A few other difference from my old I-Mate are; 

This is the best device Cingular has to offer and I am now satisfied with the phone/WM.