Working with the ASRock 880G Extreme3 was not bad. There were a few issues, though. The memory performance problem (not being able to run at 1600MHz) was an issue. If I had to make an educated guess I would have to say that the IGP cannot handle the memory at that speed (either with Sideport or on its own). This could be a tracing issue that is causing graphical data to become corrupted when it is taken from the RAM for video, or it could be an incorrect skew in the BIOS. It is something that should be resolved, though.
The IGP/RAM issue was so bad that during our overclocking session we ended up with double digit scores for 3DMark and Far Cry 2 would not load! We hope that ASRock is able to correct this in short order with a BIOS update as even at the entry level it could be a huge problem. If you are not concerned with using the IGP then the board is stable and quick.