First, it pumps. You will inflate your tire to proper pressure. You will also get a workout, as you do with any small pump. But it is very well built and designed the air that goes into the pump goes out into the tire. Also, with tubeless tires, I feel that the flexible connector reduces the stress on the valve which is secured to the rim.
But this little gem is compact. I finally found a pump that fits in my (compact) saddle bag!
If size is not a concern, a slightly bigger one will get the pumping job done faster. But since I do not plan on having flats often, I trade inflation workout for compactness -)!
I like how this pump solidly connects (Schrader or Presta) w/ a screw-like action to tube valve. Yes it requires assembly, but this allows the important parts to stay clean. Well engineered!