The sound obviously is totally different as a real old-school sampler really shakes the speakers but if taken as simple distortion unit it can be useful.
At very high gain values it's quite raw convincing, especially on percussive material.
TimeMachine is a VST plugin that provides accurate reproduction of the characteristic sound of vintage samplers, such as the Commodore 64, or older Akai samplers. The (virtual) sampling rate can be varied, as well as the number of bits used for digital representation. furthermore, aliasing distortion can be generated individually for AD and DA conversion.
Find it here