These are not overshoe replacements and will not do the job if water, snow, hail or mud is over about 3" (about 76mm) deep.

The good:
Well made should be durable.
Rubber teeth (the black in the picture) hold the shoe into the cover.
Good traction.
Provides some cushion on hard surfaces.

The Bad:
Make sure to check the sizing see
"Find the Perfect Fit
Tidy Trax sizing is determined by "shoe length"--NOT shoe size. To find the shoe cover that fits you best, measure the sole of your shoe from heel to toe, and then compare the length to the Tidy Trax size chart. Tidy Trax come in 12 convenient sizes that approximately fit men's shoe sizes 6 to 14 and women's shoe sizes 4 to 11."
You must use the "Tidy Trax size chart" link as you measure the shoe that you are going to wear; little relation to shoe size.  I wear a size 9 but take a G size--11 7/16in (29cm) and the H size would have worked as well.
Not usable with a light soft shoe.

The ugly:
Stiffens up in cold (after wading through 3" of hail was very hard to get off).
Large and bulky.
Butt ugly.

Overall does the job conveniently and well.