I guess I'm not willing to put up with the time and pain of the other pumps. The Road Morph worked so well (though I only had to use it once). I am weak enough as it is and scared to death of anything mechanical. Although that one you posted SadieKate, looks promising.
I've avoided the issue by hardly ever riding alone. I have the cartridges and when I ride alone, it's usually not that far from home and it's in places where it's quite likely other cyclists will be by if I am really in a fix. I know this is stupid, but I spent quit a bit of time a couple of years ago being paralyzed by the fear of a flat. This seemed to be a good compromise. So, while I will do a 25 mile ride alone, I won't go out for 50 miles alone...