Schwalbe tubes cost a bit more than most other tubes, but from the moment you open the box, you can tell why. Schwalbe rubber just feels different. It's tough and yet supple. And the valves- they're not the ordinary rubber towers, they are top quality metal, threaded all the way down. Why? So they are easier to mount, and won't slip and slide inside the tire, even when the pressure is low.
Ever seen a tire with the stem bent at an angle? That's because the tube has been pushed around inside the tire, either from when it was installed, or from hard braking when the inflation was low. You won't see that with these tubes- the threaded metal tower has a threaded collar that ensures the stem stays aligned. Besides looking nicer, it cuts down the chances a tipped over stem will fail and cause a leak.
And while we're on the topic of looking nicer, Schwalbe tubes have the nicest valve caps. They are molded from seriously tough clear plastic, and they look and feel just way nicer than typical caps. It's a small thing, but a nice touch, one that only comes with quality.
Pumping up tires can be a series of little annoyances- removing the cap, getting the pump head on, pumping up the tire, finding the cap again, putting the cap back on, etc. Besides the very nice habit of not needing to be pumped up nearly as often, Schwalbe tubes have a number of features to make the whole process easier. First, the cap is easy to grip, even with gloves. Second, the cap is tapered, so if you set it down, it won't roll away very far. Third, the fact that the stems are anchored to the rim means it's easier to get the pump head on, since the stem doesn't bend out of the way or poke back into the tire when you're trying to get the pump on. And lastly, the precision threading on the stem is easier for your pump to grip, so you are more likely to get a good grip the first time. All little things, sure, but the niceness adds up, and if you're like us, you'll come to enjoy these little things and be glad you paid a bit more to get them.