Thanks for the additional feedback. Sounds perfect for what I need. Did you have any issues with your concrete slab having any bumps/dips in it?
According to the docs, I can install laminate directly over the Delta-FL, so that's the plan.
And as an update with Lowes, 2 attempts to get a sample delivered to the store failed, not sure if the store lost it, or the manufacturer never sent it. As my deadline for installation was looming, I went ahead and ordered a roll (along with the tape that goes with it). It wa due Monday, but didn't make it. Hopefully today.
PS- Costco currently has laminate flooring on sale for ~$1.20/ft with coupon.