Cannot say anything about durability (because it is still new). It does what it says... it is extremely compact and that is the reason I bought this lens to fit on my OM-10iii... i want a setup I can leave in the glove compartment of my car. Yet it offers the versatility of a FF 28-84mm with the bulk of only a FF fixed 50mm f/1.8, and not even!
BTW I also own Canon FF gear, with expensive and heavy glass. This OM-10iii + this lens will be my street-photography, stop-while-going-to-work camera. This lens is great in that respect.