As an independent test lab we run both full HALT/HASS (product fault SIMULATION not operating condition simulation) and traditional stuff like heat soak, burn in, 3 axis vibration etc.
The question to the test community is why is this technique not more commonly adopted. If it were my product I would always do it when the product was safety critical, high value/volume or had other issues like long warranty life etc. Obviously HALT/HASS doesn't replace compliance testing but it certainly cuts big chunks out of R&D testing with BETTER results (more service risk faults found for design in HALT and production in HASS).
This is a veiw from an independent (UKAS accredited) test lab operating in the UK high technology Aerospace/Automotive/Telecomms sector.
Stephen Mathews.