The lesser strength inhaler (Spiriva) I got by mistake has, in fact, turned out to be fine. I've had a couple of days with difficulty breathing but that's it. Otherwise, I have felt fine. I'm going to get Dr. Lung to switch me over when I see him in January.
Meanwhile I have two of the lesser strength ones and three of the high test on hand. I think I'll just alternate the two.
But the headline news is that now I know I can get by on the lesser one now and use the more powerful one when I get to that stage. I have COPD. It ain't going to get no better :)