In what way do you not find them robust? Just interested to know, as they seem to be well made. The potential problems in terms of lack of robustness are few.
Is there something that keeps breaking on you?
Sprocket,
Flimsy removable battery cover that easily breaks and brackets that attach to the ear cups are susceptible to fatigue cracking after prolonged use.
I have to say though that Bose are nothing short of fantastic in service support.
JT