Single-ear SMH210 and dual-ear DMH220 headsets are built in Germany and are extremely sturdy. Fixed, yet flexible mic boom means there are no moving parts to wear out or break.
Single-ear SMH310 and dual-ear DMH320 headsets are the value series as they provide a comfortable fit and good sound at a very reasonable price.
Lightweight headsets are more fragile than their full-sized counterparts, but the SMH710 is definitely not disposable. It is repairable and the ear cushion is replaceable.
The single-ear SMH910 and dual-ear DMH920 ar as durable as the SMH210/DMH 220, and manufactured in Germany. The SMH910 may be worn with the microphone on either side.