I tried an ID cane for a while, because my cane usage is pretty light-duty most of the time, but I found it to be uncomfortably flimsy on the occasions when I did need it. I've switched to just carrying a mobility cane.

Ambutech does 7-section mobility canes now (they used to only go up to 5 or 6) so you can get them really compact. Mine is about 11in long when folded and fits into my bag almost as well as the ID cane did. It's a small amount of extra weight, but it's so much more solid.

I can certainly see the appeal of them when. your cane usage is minimal, because they're super lightweight and compact, but I personally feel safer with the heavier cane.

Of course, if you're strictly using it for identification, then an ID cane is great, but most people I know who need one for ID purposes also need to use it for navigation on occasion, too.