What GMU are you considering? Flattops WA is the 2nd largest WA in Co. and encompasses GMU's 12, 24, 25, 26, 33 and 34. GMU's 12, 24 and 33 ae LE areas and the application deadline was 2 Apr, so those are pretty much out. OTC licenses are available in 25, 26 and 34. I have never hunted this area personally, but have heard it gets very crowded, not only with hunter's but weekend recreationalists as well. I have been told by locals that there are a lot of blowdowns from the beetle infestation and in 2002 wildfires got about 23,000 acres. The CDOW website is a really good source of info as is the Colorado forum on bowsite.com.
Hope this helps some.