Purchased my 2 door Jeep fresh from the factory with a hardtop, but I ordered the soft top (regular dealer option, not premium) to arrive at the same time. The dealer gave it to me in a box. Other than mixing up the poles/elbow tubing on the wrong side (damn dyslexia), I’ve never had a problem with the stiffness or tightness of the fabric.
When I put the top up, I start by hooking the front windshield clips (but don’t lock them in place), then move immediately to the rear and pull down on each corner to get those plastic bottoms into the underside groove. Other than having put a bit of weight / muscle into it, they aren’t tight. Pulling down, you can feel the bounce/spring in the tubing. Once the rear is secure, I move back to the windshield and flip the clips before raising the visors.
My only issue is when putting the roof down, there is that spring loaded locking pin just above either door, I have such frustrations with those. I’ll release the one side, and then walk over to release the other side, and as soon as I do, the previous one re-clips back into place. Sometimes I’m running from side to side trying to unclip the spring/pin before the other side relocks again. Frustrating. This is where two people would be nice. But other than the trigger happy pin clips, the rest of it is too easy.
I’ve also never really noticed a difference with or without the sun. Most times I’m putting it down early in the morning before the sun really warms, and similarly I’m usually putting it back up after supper before the dew point hits. Hate when I leave the top down and come out at after dark and the seats are all wet. Grrrrrr First world problems eh?