I've hunted one HMA so far, for doe antelope 3 non-consecutive days. On day one, I saw very few antelope, and the ones I did see were very skiddish. This was during a time when permits were limited. A couple days later I went again and didn't see any on the HMA. A week later, when the permits were unlimited, I didn't see a single antelope on the HMA again.
I ended up filling my tag outside of the HMA on a piece of land the game warden told me most people don't realize they can hunt on. It was crawling with antelope. Prior to talking to us, he talked to a group of hunters that literally watched me kill my doe. According to him, they were very surprised to see me so far from the road. I will be hunting 2 or 3 more HMA's this season for antelope and deer. I think hunting HMA's is just like hunting public land. Go where the animals are which is usually where people aren't willing to go. I didn't cover the entire HMA.