Saw a review on another site about a guy's UPO that he took to Iraq, it finally died on him after two years, but only the crown and tube, which he got repaired.
So far it has held up despite being down 100 or so feet during an active dive, lived through a 120mm rocket impact 25m away (what I think initially loosened the rotor), being bounced across concrete along with me after afrementioned impact, been knocked about inside a HMMWV on some of the worst roads in Iraq, made it through a sandstorm (13 SEP IVO Samarra) that got sand into places I wasn't aware existed on my body, withstood being on my wrist through 3 months of actions on drills, took recoil forces from 5,000+ rounds of .45 ACP hardball, a 220V shock and hours upon hours of 130+ degree heat.