Yes it's well made in my opinion, Oglesby & Butler manufacture the Portasol brand of gas tools and these have a good name so the company has experience in building devices that last.
The main external construction is plastic which some complain about, here is a quote from the manufacturer when asked about why they selected plastic for the casing
The Outside plastic is not your everyday commonly found plastic.
It is Ultem 1000 which is FDA and United States Pharmacoepia Class VI compliant. Ultem 1000 is a thermoplastic polyetherimide high heat polymer designed by General Electric. Ultem is also commonly machined into parts for reusable medical devices, electrical/electronic insulators and a variety of structural components requiring high strength and rigidity at elevated temperatures.
The reason we picked this plastic was because it has low thermal conductivity. If we used metal or other far cheaper plastics like glass filled nylon we could not make it so small without burning your hand off.
The internal plastics are made from DuPont Automotive Zenite* liquid crystal polymer, which also has a very low thermal conductivity and is FDA approval for use in repeated food-contact applications. Zenite* liquid crystal polymer is also used in auto ignition fuel handling, ovenware and the aerospace industry and for fuel or gas barrier structures.