I use them and they work great. I use sections of PVC pipe in two manners for coons: (1) I use a 24" section of 4" white pipe for use with the "Coon Cuffs" dogproof coon trap. That trap slides in nicely into the end of this pipe if you cut a 5" deep and 1" wide notch into one end for the chain rivet. I add a smear of lure/bait inside the pipe and shove the pipe either into a bank over a coon trail or will shove this into the bottom in the creek and angle it upward slightly back toward the shallow water's edge or trail. the other (2) is to just use the section of PVC pipe (same length) with smear of lure or bait inside and shove into bank or stream bottom and bed a foothold about 10" out from the opening of the pipe.
The white pipe has a lot of eye appeal from a distance and if set where coons can reach the end of it to investigate the odors coming from within, they work this set quite well for me with either footholds or the Coon Cuffs trap models.