We had the last hp5890s before the switch to the 6890. Suddenly, it looked like we would need to run a bunch of emergency samples, quickly. That meant much OT, a lot of 5-9s He, and so on. A quick call to Agilent came up with the fast GC mentioned above. It would have taken some instrument modification, but the cost was relatively low. And it would have dramatically saved time. In the end, the extra testing was not needed, so I have no hands on experience.