Until either the 830 gets cheaper at ATT or the phone finally stops working (or a better deal comes along, but not too likely with the focus being on low-end and W10 is a fairly long ways off). It's having its issues - not coming on, keyboard not responding during use, SIM card error (although that has been lessened by the scotch tape fix). Certainly not considering the M8 as a replacement; not so much because of the 8X issues, but more of the fact that for our needs the M8 is way overpriced compared to the 830 which has a better camera and hopefully Nokia's quality.
We got an 8X and a 920 at the exact same time; the 8X feels on its last legs, the 920 feels like it did on day 1. I didn't realize why people thought so much of Nokia build quality, but I do now (yet, I realize that may decrease some with Microsoft and also that there have been exceptions).