I've been to NW MT twice for spring bear. Never really timed it right for the areas I hunted though. Saw lots of sign each time, there were bears around for certain. Saw one nice blackie the first trip but no shot, 3 griz the second trip and no blacks.
I hunted CA back in 2016, during the fall. Same deal, lots of sign but no sightings.
I had a CO tag in my pocket a couple years ago, and did see a nice bear the night before my season opened. I was primarily deer hunting though, and killed a deer fairly quickly then left to try and fill another deer tag in Kansas.
I hunted SE AK a little while back, and there really is no comparison between there and anywhere in the lower 48 I've been. I got a bear fairly easily there and have eaten every other bear tag I've held. The downside with SE AK is that most DIY friendly areas are on a draw, and you've got to plan the trip at least a couple years out.
I would certainly go back to NW MT for a spur of the moment spring hunt. I'm also interested in Idaho and Oregon, but I don't think it makes a lot of sense to drive through MT to get there.
One of these years when the draws aren't good to me, I'm definitely going to hit Colorado in early September with a couple bear tags.