I went to the group interview at Skywest in Salt Lake on Jan 3.
I came back on Jan 18 for the 8 hour endurance interview.
I was hired for Feb 12.
One of the guys that didn't make it in my group flew for either Mesa, or somebody else, and couldn't pass their 70 question written test (50 ATP questions, right out of the Gleim book, and 20 mechanical aptitude questions).
Another guy failed the simulator. I recommend lots of practice in the ATC-810 or Frasca 142 (the less stable of the two) sim, even if you think you're hot sh*t behind the yoke.