So, do you like mountains, running downhill for hours and smaller-scale events? This is the one for you!
There's a 1,500ft elevation drop over the full marathon course, and you definitely feel it when you finish. A finish that's waaaay faster than you normally would, I might add. You run along the Rio Grande trail, starting in Aspen and finishing at Basalt (nope, hadn't heard of that town either). The views are spectacular: once in a lifetime views that most will never see, and that alone has made this run worth it.
The event itself is rather small, maybe less than 500 full marathon runners, and maybe half that for the half. This is probably why the expo was so small. My perspective is that if there's less than 5 vendors, then mail off the packets: don't make them mandatory pickup the day before (especially in a remote mountain town that's hard to reach!).
That aside, the finish line was well organised, decent refreshments and music, and clear instructions and support. Water stations along the course were well spaced and well manned, street crossings were painless and fully supervised by volunteers, and transportation was quick and painless.
If/when you stay in Aspen for this event, strongest recommendation is the St. Moritz Lodge. Cheapest prices in town, but great walking distance to the starting gate, great amenities and it's not a faceless Super8 style hotel. Feels like a nice BnB, somehow.