Plus more expensive pumps generally are heavier, sturdier, and put out quite a bit more air volume per pump stroke. I've got an inexpensive Specislized that works okay. But when I need to get up to 115 lbs, the last couple strokes are difficult and the pump shakes a little bit. On the other hand I've also got a high end Giant. It easily goes to goes much higher for tubulars and it's constantly easy getting there. The guage is much easier to see as well.