I have not marked fish through the ice yet , but depth yes. A quick little dish with the auger, some water and your good. I have heard of guys using a baggy of a low temp fluid but I have not tried that yet.
I'm thinking of getting one myself,I use a large portable ment for summer I had to rig up for winter. It works but it's on the large side. Found this link to some earlier talk about the unit in question.