It's German. What would you expect? ,-) Nice to be able to quickly check my pressures without using the pump. More precise this way too as it measures in the tire not the pump cylinder (as pump gauges do).
Cartridge inflation is useful when you need save space, weight, and time. I keep a fresh tube and inflator system ready to go on my road bike that has scarce room for a pump. Otherwise, this is a commodity product that does what it's supposed to do.
This thing works exactly as you'd hope.
Tubeless mounting? Charge it up to 160, make sure the tire is as spread as possible, let 'er rip.
Standard tire pumping? You don't have to pre-fill the chamber, you treat it like a normal floor pump.
ONE NOTE I had the pump head pop off a couple of times upon first use, and realized that you have to jam it on a bit more firmly than you'd think. Learned that lesson through trial, and now it stays on without issue.
Have everything ready before puncturing the cylinder. I usually bring a back up cylinder. One time use but the top is reusable. A must have if you don't have a mini pump.