Totally DSE for control, I'm actually a trained DSE tech - we love them out in muddy fields!! They come as standard fitted to Perkins sets which means I'm probably starting to answer my own question, but it was more the engine reliability issues (when stood idle for months at a time, even with run-up cycles) of the variety of makes we now have in the market...... there's a reason I'm so familiar with the inner workings of so many different sets!!