This paper selects a popular z-domain adaptive controller based on output feedback pole placement, utilising recursive least squares for system identification. The adaptive algorithm is recast in the delta-domain with a corresponding reformulation of the identification algorithm. Simulation results, incorporating finite word-length effects, are convincingly used to demonstrate the improvement in the delta formulation, when smaller word-lengths are used. Small word lengths are a feature of most popular industrial controllers. In addition, a pilot-scale rig is used as an application example to demonstrate the effectiveness of the delta controller in real-life implementation. The paper concludes by comparing and contrasting the z- and delta-controllers not only in performance terms but also in terms of design complexity, intuitive appeal and cost benefits.