Long time reader, first time poster here, I too am a large advocate of going to a system like Wyoming's that impartially manages reservations in a more fair a consistent manner.
I am a Montana native that now lives in Wyoming and have long experience with both programs, and I hunt both states heavily every year. I've been using BMAs since the Brown Ranch near Mosby was still enrolled in the program and it's been out of the program since at least 1999-2000, and I hunted it for at least 5 or 6 years before they disenrolled and went to an access fee, so I think I've got a decent basis to speak from. I've found over the years that there are quite a few land owners that are leeches.
While I was in college at MSU, I used to try and see how many of these areas I could hunt in a season. My friends and I would split up and call places and see what kind of different access we could get and it has always varied widely, but over the years I've probably hunted at least 100 different BMA properties all over the state, possibly more. Several people here have mentioned Spear Lazy U as an example of a poor performer and I would agree, I used to call every year to try and get access especially since my family owns a cabin up the Smith Creek drainage and I've hunted the Crazies nearly everywhere you can from a public access standpoint. I always wanted to try and hunt Goat Mountain as I often used to see elk herds through the spotting scope up there but I've never been able to secure access. On the other hand I've hunted another ranch in the program and been able to get fair access on the eastern side of the state for at least 10 years running and have taken probably 9-10 large mule deer bucks, two that I consider trophies, and have never gone home empty handed there in the last number of years. However, I think one reason the hunting there is so much better is that it's administered by FWP technicans most of the season which makes a big difference for fair access to the property.
As far as my Wyoming experience, I have used the HMA program to secure excellent access for pronghorns the past number of years I've been a resident and had great results. My one criticism of Wyoming's program is that it is not nearly as big and in my experience like has been mentioned, tends to have many more restrictions with regards to when and how you can hunt. I'd like to see a combination of the two, something the size and scale of Montana's program with the updated technology that the HMA program brings to bear. However, with the current crop of idiots who occupy seats in the Montana legislature I see it as unlikely that it will change for the better anytime soon. I too pledge that when I find the places in the BMA program in Montana that I have evidence that are leeching I will do my utmost to report them to the proper authorities, they don't need my money. Sorry for the long and rambling post, but I thought it was worth sharing.