Quill stems. Makes adjusting the bar height so simple. No torque wrench required, No headset to even think about, No spacers to chase. You can ride a slammed stem today and raise it 2-3" tomorrow. Change the bar height out on the road. (Yeah, you might have to "convince" the stem to loosen with a rock to the Allen key but those rocks are usually not hard to find.) You have to really work at over-tightening and doing any harm and too loose (unless absurdly so) doesn't matter Plus they look so much cleaner than any threadless stem.