I have both a 809 and an 809C. I have had no problems with either one, but there are some "off" things about them.
The mag release on both are odd, the 809 fullsized's mag release is stiff, to put it mildly, if pressed from the left side, but from the right side, I can do it easily with my trigger finger. The stiffness is slowly lessening, but it's taking a while.
On the compact one, the mag release sometimes just barely releases the mag, other times it works fine. I don't seem to be able to see any obvious problem inside to cause it.
The compact, when I first got it seemed to be a little sensitive to being dirty. It sometimes refused to fully go into battery when it was loaded up and needed to be cleaned. I just pushed it closed and kept shooting. That problem disappeared soon though.
My main issue has been finding another mag for the 809C, I've actually ordered them 2 different times and the order has been cancelled almost immediately. This is another problem Taurus has that is self inflicted and totally unnecessary.