Obviously, YMMV with this, as evidenced by the above posters. But I have found less and less R space and (especially out of YYC) fuller J cabins. It is very difficult to upgrade the TATL flights as SE (!!) now, while it used to pose no problems for AC*Es (when I was one).
I am not sure how things are from AC's other hubs, but I know in YYC there are frequently SEs who aren't upgraded.

The biggest issue is that nobody has any clue how the upgrade list works now. Even the concierges have no clue, and some things are completely off in the list, without any explanation. That's my biggest issue. If I was consistently the last one on the last (for example) I could decide to move my business elsewhere. But this method just makes me uncertain and basically I have to rely on the mercy of the "upgrade gods" to get my upgrade(s).