The course is the most beautiful and scenic course I have run in my 9 marathons. It could potentially be a very fast course if you have better luck with the weather than the past 3 years. 2014-2016 have all had very rough weather with this past year being the worst conditions I have ever run in. 25 mph winds with 40+ mph gusts and 44 degrees with over a half inch of rain for the day. Over 1000 people did not finish because of the weather. However the things the race could control were done very well. Aid workers, shuttles, finish line party, beer garden and community support were all great.
The second half is very downhill and could allow you to negative split the race if you don't go out too fast. Once you are in the canyon you can cruise to the finish pretty easily.