The build quality is very good. Before that I had a ring RAC630. He was also good and worked for 11 years. I hope that 70mai will also work for a long time. Compared to the Ring RAC630, the 70mai TP01 is quieter and more accurate. For example, to inflate an impeller to 2.3 bar, you had to indicate 2.4 or 2.5 on the ring and then possibly adjust it a little, but 70mai fill the set pressure exactly.