On the sleeping pad:
(1) Unless all your trips are in warm weather, you'll need insulation. Recommended for 20*F nights is an R value of close to 5. A lot of failures attributed to sleeping bags are really due to an insufficiently insulated pad. (Been there, done that.)

(2) Try it out on the floor of the store. When you get home with it, spend at least 1 night on the floor at home on the pad in your sleeping bag (if too warm, unzip bag and use as a quilt). Be sure the pad is comfortable while you can still return it. A lot of "established" campsites have ground that's even harder than a bare floor, if that's possible!

(3) At least with the original Klymit pads, the gaps in it may or may not match your body. I'd give it 2 nights on the floor to be sure it works for you.