i've had my DC 20-10s for over 20 years for GA stuff. when i do the CFI thing on my days off, my headset is usually older than the guys/girls that i teach/evaluate. rock solid design and it'll never probably fail (made in MA, by the way)...even though i've dropped it, accidentally kicked it, been run over by a tug, etc...
it still has the liquid filled ear cells (versus the gel ear cells), even though i've done many hours in cold climates (if it ain't broke, don't fix it).
the only thing that i've replaced is the "mic condom" after many years of screaming at students...
definitely a money saver (bough in 1989 for about 90 bucks), versus buddies that bought cheap headsets to save money in the short run, but ended up spending more dough to replace their crappy choice of crappy headset (penny-wise, but dollar-dumb syndrome).
the Plantronics ear-piece that i utilize during my "day job" works very well now as the engines are located on the tail cone...