I have a Prodigy and an Enigma.
The Prodigy came with the "ribbon" type of wrap-around, adjustable strap (referred to previously) as well as a basic elastic strap that simply hooks the sides of the quilt together. These are, respectively, the top and bottom ones in the photo.
The Enigma came with an elastic strap sewn into a loop with the quilt attachment clips threaded onto that loop, which is the middle one in the photo.
I used the simple elastic straps one time with the Prodigy. I have used the ribbon type strap a few times and the elastic loop version only a couple of times, but so far the winner by a longshot is the elastic loop version. Easy to wrap around the pad, and also holds a supplementary foam pad in place if you're using one, and the stretch reduces stress on the attachment points if you fidget about a lot (as I do!) but pulls the edges back into place after a bout of tossing and turning. I never even noticed the straps underneath my torso, although I was wearing a few layers.
The elastic loop was long enough to stretch just right around an Exped Synmat MW and a GG 1/8" foam pad on top. For a much narrower pad, I suppose one could just tie a small, loose overhand knot with the loop to shorten it.
.