I've archery hunted elk in NM for the 9 of the past 10 years and taken bulls 6 of the 9 times I've hunted. The three times I got skunked were all in unit 23. (2001, 2003 & 2005) Every time I've been, I've sworn I would never go back. The last time there, I was close on several occassions but never even saw the beast that was bugling even though I was w/in 30 yards. The elk in that unit have been overhunted, over called and etc. There are some good bulls. However, there is also a ton of country between the good ones and often lots of hunters chasing the same bugle your chasing.
Unit 15 is a great unit, though not what it was ten years ago.