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It's great stuff!!! My friends car (73 Mach 351c 4v) was running hot. Actually it has since she has had it. Her car typically ran about 2/3 of normal on the guage. After adding a bottle of water wetter, it barely runs at the mid point on the temp guage! This was checked on the E-way at 75-80 with the outside temp at 90* +.
I put some in this weekend before my little road trip, and didn't really see any difference, but like someone else said on here, i think i have more coolant than water running thru so i guess that's why i didn't really see anything.