Unfortunately, I've seen quite a lot of that. In my first test, I seriously underestimated the power of the intake from the jet, and was promptly sucked into the engine. Both myself and the engine died violently. Wiser from this incident, I carefully crafted a brick tunnel for the engine intake, and all seemed to work well. Before leaving the engine to run a while, i wanted to check the fuel level. Unfortunately, I was wielding my screwdriver at the time, resulting in the engine to turn 90 degrees, thus sucking me in again, with the predicted fatal result.
At this time, I was more than a bit reluctant to install jets in my home base (a sphere made of clear-glass), so I decided to make some tests with encapsulating the engine in a blast glass cage, and feeding zombies to it to make it blow up. The resulting explosive failure is a lot more impressive, when you are watching it from outside the engine, I might add!
I am really enjoying this mod a lot. In addition to being great fun, it just looks great with all the mechanical parts moving. Currently, I am trying to optimize gearing from two jets into an extractor. I am sending a Rednet controller wave (40 ticks on/40 ticks off) into a CTV, alternating 4x and 32x speed. The difference between this gearing, and just sending the 512Nm torque constantly into the extractor is substantial and very effective. I am guessing that this gearing can be optimized even further.