I did one at BCM (I'm a student there).
I'd say it was "good." I decided that Path wasn't really for me, but it was pretty interesting to take the elective. The time was mostly spent with following the residents however I wished (surgical, cyto, heme, autopsy, brain dissection, etc.). So I got to see a wide variety of stuff. This was at Ben Taub General Hospital.
The attending who runs that elective wanted us to go to conference every morning and then go talk to him about what we learned, so that was pretty nice and chill as well.
Some of my friends have done electives at Methodist, since it has its own residency after the split from Baylor. I hear that elective is pretty good too, with some big names in Path working there. However, people say they're a little more malignant/hard-core.