Firing attempts showed that a light combat vehicle could be equipped with heavy weapons if a muzzle brake was used. Stress on the crew compartment while shooting was acceptable and the precision was good. The accessibility tests were done primarily with Ikv 91 as a comparison vehicle, a fellow light tank. The goal was that the test rig would have as good passability as this vehicle. In obstacle trials, driving in light and medium terrain and in snow, respectively, the passability characteristics of UDES XX 20 were as good or better than in the comparison vehicles. but the main problems where its visibility. Combat position regarding observation and transition to firing were considerably greater at UDES XX 20 than an Ikv 91, an accepted light support tank, There was a greater risk of losing the target during relocation. In the firing position, the UDES XX 20 showed a higher silhouette. The problems with pulling out of position were significantly greater as well. During the maneuvering trials, the tank was fitted with a weighted dummy gun to simulate the weight of a real gun during movement. When shooting platform stability was tested the tank was mounted with a possibly modified (lower-pressure) Rheinmetall 120mm L/44 tank gun, with a custom muzzle brake designed by Bofors. Overall, on a technical level, the vehicle was sound and highly capable. Likely due to the complexity of such a design, the cost was too great for it to be considered economically viable so it never entered production.