Yeah, they aren't too heavy when you are picking up one end and using the rollers on the other end to wheel them around.
I haven't used the wall clips for storage, but as long as you set the height so the clips allow the wheeled end to sit on the floor they should be fine. I like to reduce failure points as a rule, and if mine are stored flat on the ground under a car that is rarely used and only driven by me, they are safe and can never fall from the vertical stored position and destroy one of my vehicles in the process.
The weight is equally distributed across the whole length, so the size and weight just would make them very unwieldy to lift up and move around without a second person if you are trying to lift both ends off the ground.
In use, where the weight is a hindrance is when you are trying to position them under the car. You wheel them next to the car no problem, but then sliding them under you get down on the floor and slide them. With their weight, and what I'll call the "teeter totter" nature, it takes some muscle to slide them, get them started moving, and then not overshoot. You have to put one hand near the front and one near the back and push evenly or otherwise it is just going to pivot about the center like a "teetor totter." This is why getting them lined up on the pinch welds is time consuming too, because sometimes you are just trying to move one end a small amount and you end up shifting the other end too, even though you didn't intend to. I usually minimize or stop that by bracing the end I don't want to move with my foot, and then using my hands to move the other end, and that works well, but due to the tendency to pivot if you don't apply the right amount of pressure with your foot you still have to go check that other end is still lined up correctly. Then you use the button to bump them up close to the car to really check that they are right, as with the arc motion of raising and lowering when you place them on the ground you are estimating the position of the lift block when it raises through its arc. Sometimes you have to lower them and readjust.
One of the other quirks is usually one goes up first and the other side won't raise, or at least won't raise and stay up until the first one encounters some resistance, so you get the one that goes up first set perfect, and get it bumped up against the frame until it sees some resistance from the car weight and then the other side will raise and you can go adjust things.
I know I have made these sound unreasonably heavy and difficult to set up, so I'll say it again, I love mine, and some of my issues are driven by me being anal about preserving my pinch welds perfectly.
The point of all my rambling is just to caution that you may spend $2k thinking you are going to have a way easier life in the garage, and in reality you are exchanging one set of motions and physical efforts for another. Getting them set takes a lot of laying on the floor adjusting them and then getting up and moving to the other side of the car doing the same, and then additional iterations back and forth between the sides of the car to adjust them just right, so you're standing, kneeling, laying down, and then rinse / repeat multiple times before the work starts. Pushing the controller button is super easy and gratifying, but the amount of physical effort you put in positioning them is, in my opinion, actually more than just using a floor jack and jack stands.
On the Tahoe, if it gets out of sync on oil changes with the rest of my fleet and it is the only one needing a change I usually don't screw with the quickjacks because a floor jack and jack stands will lift it high enough to get my drain can under it. And if you only need to lift one end or side of the vehicle and don't need all 4 wheels off the ground the quickjacks are more work than they are worth.
If you know all this going into you are less likely to have buyers remorse on a $2k discretionary tool purchase. I have no buyers remorse, I love them, but they are not some miracle tool that makes life less physically taxing in the garage.
