Quite honestly, I think they've improved quite a bit, especially this year. The web and app functionality isn't a problem for me and the DL Skymiles # is easy to input and has credited normally.

I was even thrilled to notice the other day that starting in mid-November, SFO-MEX will finally be rid of the old 738s with the 2x/daily service being upgraded to a 7M9 and 7M8.