The Kool Glide iron in conjunction with the SDN sure makes life a lot easier for the installer.
We have been using them together in the field every day for some time.
They are AWESOME!
In this experiment we were testing the strength of the bond. We already had a pretty good bite on it here.
Then we lowered the handle all the way down. The tension across this carpet was incredible.
Something had to give. Looks like it was the carpet. We measured 3 3/4" of stretch in just under 7 feet of carpet. By the way, this is the width we are talking about.
Take a look at where the backing stayed, and also some of the face pile as well.
If I had to choose between the SDN or the Sinch I would take the SDN.
I'm sure glad I use both everyday.