In this paper we evaluate the energy, event delivery, and delay performance of a number of medium access control protocols suitable for ultra-wideband (UWB) physical layer. While ultra-wideband is a promising technology, it creates unique challenges in MAC protocol design. Firstly, we analytically inspect the energy consumption of three UWB suitable MAC protocols and secondly concentrate on simulation of the IEEE 802.15.4 MAC and its UWB version. Comparison between UWB and direct sequence radios with the 802.15.4 MAC protocol clearly show the superior performance of UWB technology