We use the Smart-Lic stress tubs in the fall with the calves for the first couple of weeks when they are first weaned- and have had great luck... They really seem to help to prevent sick calves... The local feedlots use them in their weaning program too...
We also used the Mineral tubs and Hi-Mag tubs to get some mineral in the cows when they are on the river bottom pastures... Because of all the salt/mineral in the well water they won't touch dry mineral- but will lick the tubs...
Sorry- I can't remember what we were paying- but I know it was cheaper than Crystalyx- the reason so many locally switched...